WO1997006781A1 - Procedes permettant de rendre amorphes des medicaments peu solubles - Google Patents
Procedes permettant de rendre amorphes des medicaments peu solubles Download PDFInfo
- Publication number
- WO1997006781A1 WO1997006781A1 PCT/JP1996/002246 JP9602246W WO9706781A1 WO 1997006781 A1 WO1997006781 A1 WO 1997006781A1 JP 9602246 W JP9602246 W JP 9602246W WO 9706781 A1 WO9706781 A1 WO 9706781A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- salt
- acid
- amorphous
- soluble drug
- amorphization
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
- A61K9/141—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers
- A61K9/145—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers with organic compounds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
- A61K9/141—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers
- A61K9/146—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers with organic macromolecular compounds
Definitions
- the present invention relates to a technique for effectively using a poorly soluble drug, and more particularly to a method for producing a solid dispersion by an S ⁇ amorphous method.
- This technology is used in fields where the dissolution of drugs is an issue, for example, in the fields of agrochemicals and cosmetics, especially in the field. Background art
- Measures to increase the bioavailability of poorly soluble drugs include improving the solubility of the drug by improving the wettability and dispersibility of the drug particles, forming solid dispersions, and using polymorphs.
- a method of particular interest is a method for producing a solid dispersion by a drug amorphization method.
- a solid dispersion is a dispersion in which a drug is dispersed in a carrier in a monomolecular state and the drug is completely amorphized: a dispersion held in a ⁇ state.
- the amorphous form of H3 ⁇ 4S is in a higher energy state than the crystalline form, and is expected to have high solubility and solubility.
- the ⁇ method is a solvent method, a melting method (filing), a melting-one solvent method, a mechanochemical method, and others: ⁇ [I
- both the drug and the water-soluble polymer base as an amorphous stabilizer are dissolved in an organic solvent that dissolves the solvent, and then the solvent is distilled off in the presence of core particles or as it is,
- This is a method of obtaining a solid dispersion by dispersing.
- This method is used for the solubility of poorly soluble drugs.
- this method is an excellent method for improving the quality, it has disadvantages, such as the use of organic ⁇ 3 ⁇ 4, which leads to high costs and some cases in which the residual solvent in the drug is concerned.
- the melting method utilizes the drop of a mixture of a drug and a water-soluble polymer base as an amorphous stabilizer, and is added below the melting point of the two to disperse the drug in molecules, It is a method of solidifying and pulverizing.
- the melting method is superior in that no organic solvent is used. However, depending on the type of poorly soluble drug, sufficient amorphousization may not be obtained only by adding an amorphousizing stabilizer as a carrier for a fixed dispersion.
- the ⁇ reduction is at most 1 ov.
- the high-melting agent is often amorphous in nature, so the apparent melt viscosity is high, the microdispersion between the drug and the water-soluble polymer is poor, and depending on the drug, sufficient Amorphization may not be obtained in some cases.
- the mechanochemical method (treatment) uses mechanical energy such as rising, shearing, and friction to promote the amorphization of a drug solid and the dispersion of the amorphous drug in a carrier. Is a way to get Specifically, ball mill mixed grinding, planetary mill processing, There are processes such as ffi-shrinking press process and shear ⁇ -roll mixing process.
- the present inventors have sought to overcome the problems left in these methods; as a result of the investigation, it has been found that (1) a poorly soluble drug, (2) an amorphization-inducing agent, and (3) an amorphous stabilizer.
- a method for amorphizing a poorly soluble drug by mixing three components and subjecting the mixture to heating or mechanochemical treatment was found.
- high-frequency heating is more preferable than ordinary heating with one heater or steam heating.
- the present inventors have found a method for amorphizing a poorly soluble drug by mixing two components of (1) a poorly soluble drug and (3) an amorphous stabilizer and heating the mixture at a high frequency. .
- the poorly soluble drug (1) in the present invention is a drug having extremely low solubility in water and poor absorption from the intestinal tract, ⁇ m., Etc., and is difficult to improve the absorption by ordinary formulation. It is a drug that can increase absorption by becoming amorphous.
- dihydropyridine-based proboscis such as diphdipine and dicardipine hydrochloride, phenacetin, digitoxin, diazepam, phenytoin, tolptamide, theophylline, griseofulvin, chloramphenicol and the like can be mentioned.
- the (2) amorphization-inducing agent in the present invention may be any compound that causes a mixture with a drug to cause a drop, and a crystalline compound is particularly preferable.
- Heat or mechanical energy present below the function and property of changing the crystal eaves energy of a poorly soluble drug in the direction of lower energy and increasing the fluctuation of the crystal eaves at the same S are ⁇ ⁇ ⁇ !.
- the amorphization inducing agent selected depends on the type of the poorly soluble drug.For example, a) in the case of a basic poorly soluble drug, a neutral substance or an acidic substance, particularly an acidic substance, b) an acidic poorly soluble drug In this case, it is preferable to select a neutral substance or a basic substance, particularly a basic substance.
- amorphization-inducing agent examples include, for example, amino acids or salts thereof (aspartic acid and its Na salt, M salt, etc., glycine, alanine, glutamic acid and ⁇ glutamic acid, etc.), aspartame, erythorbic acid and salts thereof ( Na salt, etc.), ascorbic acid or its salt (Na salt, etc.), stearic acid ester, aminoethylsulfonic acid, inositol, ethyl urea, citric acid or its salt (1a, 1a.
- Salt such as dihydrogen Na, Ca salt
- Glycyrrhizic acid or its salt Na salt such as 3la, 1a, ammonium salt such as diammonium, monoammonium, K salt, etc.
- gluconic acid or its salt Na salt, Ca salt, Mg salt etc.
- creatinine, Salicylic acid or its salt Na salt, etc.
- ⁇ 3 ⁇ 4 or its salt Na salt, K'Na salt, hydrogen, ⁇ salt, etc.
- succinic acid or its salt ClNa a salt of mono-Na etc.
- calcium acetate Sodium kaolin, aluminum hydroxide, sorbic acid or its salt 00 ⁇ ), dehydro or its salt (Na salt, etc.), thioline: ⁇ sodium, nicotinic acid amide, urea, fumaric acid or its salt (Na salt, etc.), macrogol, maltose, maltol, maleic acid, mannitol, meglumine,
- the amorphization-inducing agent is an amino acid or a salt thereof (aspartic acid and its Na salt, Mg salt, etc., glycine, alanine, glutamic acid ⁇ and glutamic acid hydrochloride, etc.), ascorbic acid or a salt thereof (Na salt, etc.) , Stearic acid ester, aminoethyl sulfonate, ethyl urea, citrate or a salt thereof (HNa, ⁇ la, dihydrogen Na salt, Ca salt, etc.), glycyrrhizic acid or a salt thereof (Na salt such as 31a .: 31a, Ammonium salt, ammonium salt such as monoammonium, K salt, etc.), creatinine, sake Salt (Na salt, K'Na salt, hydrogen salt, etc.), succinic acid or its salt (Na salt such as l! A, etc.), urea, fumaric acid or its salt (Na salt such as
- the amorphization-inducing agent is an amino acid or a salt thereof (aspartic acid and its Na salt, Mg salt, etc., glycine, alanine, glutamic acid ⁇ and glutamic acid hydrochloride, etc.), ethyl urea, glycyrrhizic acid or a salt thereof (31a, Na salt such as ZlNa, etc., ammonium salt such as ammonium and monoammonium, K salt, etc.), tartaric acid or its salt (Na salt, K'Na salt, 7j element salt, etc.), succinic acid or its salt ( Ia, Na salts such as 3 ⁇ 4), urea, maltose, maltol, mannitol, meglumine, etc. More preferably, the amorphization-inducing agent is glycyrrhizic acid or a salt thereof (HNa,
- Na salts such as Na
- ammonium salts such as diammonium and monoammonium
- K salts succinic acid and its salts
- Na salts such as dia and Hfe
- urea maltol
- mannitol examples include Na salts such as Na, ammonium salts such as diammonium and monoammonium, and K salts), succinic acid and its salts (Na salts such as dia and Hfe), urea, maltol, and mannitol.
- the melting point of the mixture of the amorphous inducer and the sparingly soluble drug may vary depending on the combination of the sparingly soluble drug, but it is preferable to use a method of lowering the melting point of the sparingly soluble drug by at least 5 below the melting point.
- the heating is high-frequency heating, it is possible to amorphize a poorly soluble drug by high-frequency heating a mixture of a sparingly soluble drug and an amorphous phase without using an amorphization inducer. .
- high-frequency heating of a three-component system containing an amorphization-inducing agent gives satisfactory results.
- An amorphous stabilizer is obtained by loosening the crystal structure of a poorly soluble drug with the amorphization-inducing agent. , It interacts with the transformation of the crystal to stabilize the amorphous state. Therefore, any amorphous stabilizer that has the above function can be used in the present invention.
- any amorphous stabilizer may be used as long as it is a compound that retains a functional group that interacts with a poorly soluble drug, but preferably a flexible functional group that is highly compatible with a poorly soluble drug is thermally stable.
- High-quality ⁇ For example, is it preferable to use the following amorphous base material? The compatibility with poorly soluble drugs is high, and the solubility parameter of both compounds is close to the solubility parameter (Solubility Parameter .-ENCYCLOPEDIA OF POLYMER SCIENCE AND BNG INBBRING, VOL 15 P393, JOHN WILEY & SONS, INC. 1989). ⁇ value compound.
- the amorphization stabilizer is a compound having a high compatibility with not only a poorly soluble drug but also an amorphization inducer.
- the functional groups of interacting amorphous amorphous ij selected according to the type of poorly soluble drug are different.
- a basic poorly soluble drug a neutral substance or an acidic substance
- an acidic substance and b) an acidic poorly soluble drug it is preferable to select a neutral substance or a basic substance, particularly a basic substance.
- Examples of the (3) amorphous stabilizer in the present invention include cellulose derivatives (for example, hydroxyethyl cellulose, hydroxypropyl methylcellulose (HPMC), hydroquinpropyl cellulose (HPC), hydroquinpropyl methylcellulose acetate succinate (HPMC-AS), methylcellulose, ethylcellulose, carboxymethylcellulose, cellulose phthalate, etc.), polyvinylpyrrolidone, cross-linked polyvinylpyrrolidone, polyvinyl alcohol, polyvinyl acetate, vinyl alcohol 'acetic acid Vinyl copolymers, ethylene 'vinyl acetate copolymers, polyethylene oxide derivatives (eg, polyethylene glycol, polyoxyethylene polyoxypropylene cetyl ether, polyoxyethylene alkyl) Ethers, polyoxyethylene O Chi le-phenylene ether, polyoxyethylene O rail ⁇ Min, polyoxyethylene O Rail Ether, sodium polyoxyethylene oleyl phosphate, polyoxyethylene castor oil,
- compounds having a gel forming ability for example, silicon dioxide, 7K aluminum oxide and the like can also be used as the amorphous stabilizer of the present invention.
- amorphous stabilizer hydroquinethyl cellulose, hydroxypropyl methylcellulose (HPMC), hydroxypropyl cellulose (HPC), hydroxypropyl methylcellulose acetate succinate (HPM C-AS), polyvinylpyrrolidone, polystyrene Sodium sulfonate, dextran, / 8 or arcyclodextrin, acrylic resins (methacrylic acid, methyl methacrylate, butyl methacrylate, dimethylaminoethyl methacrylate, trimethylammonium methyl methacrylate, Methacrylic acid derivatives such as acrylic acid and ethyl acrylate, and homopolymers or copolymers derived from Z or acrylic acid, etc.) and polyvinyl acetal getyl aminoacetate
- hydroquinpropylmethylcellulose mouth HPMC
- HPMC-AS hydroxypropylmethylcellulose acetate succinate
- polyvinylpyrrolidone acrylic resins (methacrylic acid, methacrylic acid) Homopolymers of methacrylic acid derivatives such as methyl acrylate, butyl methacrylate, dimethylaminoethyl methacrylate, trimethylammonium methacrylate, acrylic acid, ethyl acrylate, etc., and Z or acrylic acid derivatives Copolymer and the like) and polyvinylacetate dimethylaminoacetate and the like.
- the spleen of (1) a poorly soluble drug, (2) an inducer for amorphization, and (3) an amorphous stabilizing agent is appropriately determined depending on the type of the poorly soluble drug used.
- the solid dispersion of the poorly soluble drug of the present invention comprises the following components: (1) a poorly soluble drug, (2) an amorphous inducer, and (3) an amorphous stabilizer, which are granulated by a wet or dry method.
- the heating of the mixture at this time is preferably carried out at a temperature equal to or lower than the melting point of the poorly soluble drug, and is preferably as close as possible to the start of amorphization induction. If the addition is lower than, for example, 5 to 1 CTC, the amorphization will not proceed sufficiently.
- Heat treatment may be performed at the time of granulation, and after granulation, it may be performed by a usual heating method such as heater heating, steam heating infrared ray heating or far infrared ray heating, for example, a shelf dryer, a fluidized bed dryer, a gyro.
- Amorphization may be performed by heat treatment with a dryer, a powdered dryer, or the like.
- Amorphization is possible by mechanochemical treatment using not only heat but also mechanical energy such as] ⁇ , shearing, and friction.
- non-amorphization can be achieved only by mechanochemical treatment, such as ball milling, planetary milling, Bii pressing, shearing, and so on, without heating the three components mentioned above. It is possible. According to this method, it becomes possible to amorphize even a drug unstable to heat.
- the processing time required for amorphization is generally 20 minutes to 120 minutes, preferably 30 minutes to 90 minutes for heat treatment, and 1 minute to 20 minutes, preferably 3 minutes to 90 minutes for mechanical energy processing. 10 minutes is preferable from the viewpoint of quality control, uniformity, and energy saving.
- high-frequency heat treatment can be used in addition to the above-described normal heat treatment.
- the peripheral band can be selected depending on the object to be heated, and micro ira heat using a microphone aperture band is particularly preferable.
- Microphone n3 ⁇ 43 ⁇ 4ra heat can be used for 4 laps assigned to the ISM (Industrial, Scientific and Medical) frequency by the Radio Law, namely 915, 2450, 5800, and 22125 MHz. Typically, use a 915 or 24501 ⁇ 112 circumference.
- Microphone 3 ⁇ 43 ⁇ 4 ⁇ Heating method can be selected by oven type (microwave oven ⁇ ; conveyor type) or waveguide: ⁇ depending on the shape of heat source.
- the solid dispersion of the sparingly soluble drug is obtained by granulating (mixing) (1) the sparingly soluble drug and (3) an amorphous stabilizer in ⁇ ; It is obtained by doing.
- the processing time required for amorphization with high ambient heat varies depending on the high-frequency output. 3 to 40 minutes, preferably 5 to 30 minutes is preferable in terms of quality control, average “ ⁇ ”, etc. in the case of the chilling process. High-frequency heating can provide a highly uniform solid dispersion in a short time compared to the time required for normal heat treatment.
- granulation there is no special method for granulation (mixing), and a universal mixer, a m-place, a dash mill, a wet granulator, a granulator, and the like are used.
- ordinary granulation, processing or mechanochemical treatment eg, pole mill grinding, planetary mill treatment, press treatment, shear roll treatment, flow coater, kneader treatment, etc.
- mechanochemical treatment eg, pole mill grinding, planetary mill treatment, press treatment, shear roll treatment, flow coater, kneader treatment, etc.
- the usual mechanical ax using a shelf dryer, a layer dryer, a gyro dryer, a powder dryer, etc. may be subjected to the above mechanochemical treatment.
- the amorphization inducing agent and (3) the amorphous stabilizer are used.
- An activator, an antioxidant, a preservative, a stabilizer, etc. may be blended to make the material amorphous.
- the (2) amorphization inducing agent and (3) the amorphization stabilizer can be made amorphous by mixing one component or two or more components, respectively.
- the crystallinity is measured by powder X-ray diffraction measurement. Perform powder X-ray diffraction measurement of a simple mixture of the three components of the poorly soluble drug, the amorphization-inducing agent, and the amorphous stabilizer, and read the diffraction (SO) at a diffraction angle of 20 derived from the crystal of the poorly soluble drug. Similarly, the diffraction (S1) of the poorly soluble drug after heat treatment or the like is read, and S0 is plotted on the horizontal axis and SI is plotted on the vertical axis for each corresponding crystal peak. Approximate by a regression line passing through the origin, and the degree of crystallinity (%) is defined as 100 times the slope. For example, if the crystallinity does not change, that is, if the crystallinity is 10096, the regression elevation angle will be 45 ° and the slope will be 1. For a crystallinity of 10%, the slope is 0.1.
- Example 2 A mixture of 150 g of dicardipine, 100 g of urea and 150 g of hydroxypropylmethylcellulose (HMPC) in a tray dryer under atmospheric pressure. Heat treatment was performed for 1 hour at C to obtain a solid dispersion. In this solid dispersion, no crystalline peak of dicardipine hydrochloride was observed.
- HMPC hydroxypropylmethylcellulose
- ill ⁇ are hydrochloric two Karujipin is 170 e C, it is a mixture of urea 137 ⁇ two Karujipin and urea 129, amorphous-inducing starting temperature was at 1 15. 100 g and 00 g of crystalline cellulose were added to 300 g of the solid dispersion, and the mixture was subjected to dry granulation by a conventional method, followed by tableting to obtain a solid tablet.
- Example 2 instead of the heat treatment for 1 hour in Example 1, heating was performed by microwave for 20 minutes using a microwave drier (frequency 245 mm) for 20 minutes to obtain a solid dispersion. .
- This solid dispersion was amorphous without any crystalline peak of difezedin.
- Example 1 the same procedure as in Difficult Example 1 was performed except that only
- Example 2 was carried out in exactly the same manner as in Example 2 except that only one of the following was changed.
- Example 3 a test was performed except for only urea (amorphization-inducing agent). As a result of powder X-ray diffraction, the crystallinity was 80%.
- Example 5 The procedure was performed in exactly the same manner as in Example 2, except that the heat treatment was performed for 1 hour with a ⁇ type drier instead of the microphone mouth-wave heating of Example 5.
- the crystallinity of dicardipine hydrochloride is 70%, not a complete solid dispersion and the availability of i o production
- the poorly soluble drug can be converted into an amorphous solid dispersion, and the solubility and absorption of the poorly soluble drug can be improved to improve the biological properties. It can be expected to enhance usability.
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Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ315089A NZ315089A (en) | 1995-08-11 | 1996-08-08 | Method for converting sparingly water-soluble medical substance to amorphous state |
AU66693/96A AU702088B2 (en) | 1995-08-11 | 1996-08-08 | Methods for converting sparingly water-soluble medical substance to amorphous state |
EP96926600A EP0852140B1 (en) | 1995-08-11 | 1996-08-08 | Methods for making hardly soluble medicine amorphous |
US09/011,060 US6462093B1 (en) | 1995-08-11 | 1996-08-08 | Method for converting sparingly water-soluble medical substance to amorphous state |
DE69630964T DE69630964T2 (de) | 1995-08-11 | 1996-08-08 | Verfahren, um schwerlösliche arzneistoffe in einen amorphen zustand zu bringen |
AT96926600T ATE255405T1 (de) | 1995-08-11 | 1996-08-08 | Verfahren, um schwerlösliche arzneistoffe in einen amorphen zustand zu bringen |
NO19980549A NO320486B1 (no) | 1995-08-11 | 1998-02-09 | Fremgangsmate for fremstilling av en fast dispersjon av en darlig vannloselig medisinsk substans |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20593695 | 1995-08-11 | ||
JP7/205936 | 1995-08-11 | ||
JP7/310400 | 1995-11-29 | ||
JP7/310401 | 1995-11-29 | ||
JP31040095 | 1995-11-29 | ||
JP31040195 | 1995-11-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997006781A1 true WO1997006781A1 (fr) | 1997-02-27 |
Family
ID=27328563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1996/002246 WO1997006781A1 (fr) | 1995-08-11 | 1996-08-08 | Procedes permettant de rendre amorphes des medicaments peu solubles |
Country Status (15)
Country | Link |
---|---|
US (1) | US6462093B1 (ja) |
EP (2) | EP1356807A3 (ja) |
JP (1) | JPWO9706781A1 (ja) |
KR (1) | KR100498813B1 (ja) |
CN (1) | CN1089232C (ja) |
AT (1) | ATE255405T1 (ja) |
AU (1) | AU702088B2 (ja) |
CA (1) | CA2228907A1 (ja) |
CZ (1) | CZ296072B6 (ja) |
DE (1) | DE69630964T2 (ja) |
MX (1) | MX9800717A (ja) |
NO (1) | NO320486B1 (ja) |
NZ (1) | NZ315089A (ja) |
TW (1) | TW487582B (ja) |
WO (1) | WO1997006781A1 (ja) |
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EP0901786A3 (en) * | 1997-08-11 | 2000-01-19 | Pfizer Products Inc. | Solid pharmaceutical dispersions with enhanced bioavailability |
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Also Published As
Publication number | Publication date |
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EP1356807A3 (en) | 2004-01-28 |
EP1356807A2 (en) | 2003-10-29 |
DE69630964D1 (de) | 2004-01-15 |
CZ296072B6 (cs) | 2006-01-11 |
NO980549L (no) | 1998-04-02 |
MX9800717A (es) | 1998-11-30 |
NZ315089A (en) | 1999-06-29 |
AU702088B2 (en) | 1999-02-11 |
CZ32698A3 (cs) | 1998-06-17 |
EP0852140A1 (en) | 1998-07-08 |
CN1089232C (zh) | 2002-08-21 |
CN1192677A (zh) | 1998-09-09 |
NO320486B1 (no) | 2005-12-12 |
US6462093B1 (en) | 2002-10-08 |
EP0852140A4 (ja) | 1998-07-29 |
AU6669396A (en) | 1997-03-12 |
KR100498813B1 (ko) | 2006-02-28 |
CA2228907A1 (en) | 1997-02-27 |
KR19990035836A (ko) | 1999-05-25 |
NO980549D0 (no) | 1998-02-09 |
DE69630964T2 (de) | 2004-10-28 |
EP0852140B1 (en) | 2003-12-03 |
TW487582B (en) | 2002-05-21 |
JPWO9706781A1 (ja) | 1997-02-27 |
ATE255405T1 (de) | 2003-12-15 |
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