Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
  • A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
  • A61K31/4427—Non condensed pyridines; Hydrogenated derivatives thereof containing further heterocyclic ring systems
  • A61K31/444—Non condensed pyridines; Hydrogenated derivatives thereof containing further heterocyclic ring systems containing a six-membered ring with nitrogen as a ring heteroatom, e.g. amrinone
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/02—Inorganic compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
  • A61K47/08—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
  • A61K47/12—Carboxylic acids; Salts or anhydrides thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
  • A61K47/16—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing nitrogen, e.g. nitro-, nitroso-, azo-compounds, nitriles, cyanates
  • A61K47/18—Amines; Amides; Ureas; Quaternary ammonium compounds; Amino acids; Oligopeptides having up to five amino acids
  • A61K47/183—Amino acids, e.g. glycine, EDTA or aspartame
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/44—Oils, fats or waxes according to two or more groups of A61K47/02-A61K47/42; Natural or modified natural oils, fats or waxes, e.g. castor oil, polyethoxylated castor oil, montan wax, lignite, shellac, rosin, beeswax or lanolin
• • 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
  • A61K9/0012—Galenical forms characterised by the site of application
  • A61K9/0048—Eye, e.g. artificial tears
• • 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
  • A61K9/08—Solutions
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P27/00—Drugs for disorders of the senses
  • A61P27/02—Ophthalmic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P27/00—Drugs for disorders of the senses
  • A61P27/02—Ophthalmic agents
  • A61P27/06—Antiglaucoma agents or miotics
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
  • Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Definitions

• the present invention relates to a pharmaceutical composition
• a pharmaceutical composition comprising Isopropyl(6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylamino)acetate or a salt thereof, and a method for stabilizing the compound or salt thereof.
• Isopropyl(6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3y1sulfonyl)aminomethyl ⁇ pyridin-2-ylaminolacetate is a compound represented by the following formula (1):
• Patent Document 1 and Patent Document 2 mention pyridylaminoacetic acid compounds such as isopropyl (6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylaminolacetate, and Patent Document 1 mentions, as eye drops of the pyridylaminoacetic acid compound, Formulation Examples comprising concentrated glycerol and Polysorbate 80.
• pyridylaminoacetic acid compounds such as isopropyl (6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylaminolacetate
• Patent Document 1 mentions, as eye drops of the pyridylaminoacetic acid compound, Formulation Examples comprising concentrated glycerol and Polysorbate 80.
• Patent Document 1 does not mention a pharmaceutical composition comprising isopropyl (6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylaminolacetate or a salt thereof and polyoxyethylene castor oil, and also there is absolutely no mention that polyoxyethylene castor oil improves stability of the isopropyl (6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylaminolacetate or salt thereof in the pharmaceutical composition.
• Patent Document 1 U.S. Published Patent Application Publication, No. 2012/0190852, Specification
• Patent Document 2 U.S. Published Patent Application Publication, No. 2011/0054172, Specification
• the present inventors At a stage of development of a pharmaceutical composition comprising isopropyl (6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylamino)acetate or a salt thereof (hereinafter also referred to as “the present compound”), the present inventors have found that, in an aqueous composition comprising the present compound dissolved therein, stability of the present compound is inferior.
• the present inventors have intensively studied about a surfactant for dissolving the present compound so as to achieve the above objects, and found that the present compound in a pharmaceutical composition has a high remaining rate even under long-term storage when using polyoxyethylene castor oil, thus completing the present invention.
• the present invention is related to the following.
• a pharmaceutical composition comprising isopropyl (6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylaminolacetate or a salt thereof, and polyoxyethylene castor oil.
• polyoxyethylene castor oil includes polyoxyethylene castor oil selected from the group consisting of polyoxyl 5 castor oil, polyoxyl 9 castor oil, polyoxyl 15 castor oil, polyoxyl 35 castor oil, and polyoxyl 40 castor oil.
• the present invention it is possible to provide a pharmaceutical composition in which the present compound in the pharmaceutical composition is stabilized over a long period of time.
• the pharmaceutical composition of the present invention has enough safety as a pharmaceutical product.
• a salt of isopropyl (6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylamino)acetate is not particularly limited as long as it is a pharmacologically acceptable salt.
• inorganic acid salts such as hydrochlorides, hydrobromates, hydroiodides, nitrates, sulfates, or phosphates; or organic acid salts such as acetates, trifluoroacetates, benzoates, oxalates, malonates, succinates, maleates, fumarates, tartrates, citrates, methanesulfonates, ethanesulfonates, trifluoromethanesulfonates, benzenesulfonates, p-toluenesulfonates, glutamates, or aspartates.
• hydrochlorides or trifluoroacetates are exemplified.
• the content of isopropyl(6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylamino)acetate or a salt thereof is not particularly limited.
• the lower limit is preferably 0.0001% (w/v), more preferably 0.0003% (w/v), still more preferably 0.0005% (w/v), and yet still more preferably 0.001% (w/v).
• the upper limit is preferably 0.1% (w/v), more preferably 0.03% (w/v), still more preferably 0.01% (w/v), yet still more preferably 0.008% (w/v), even still more preferably 0.005% (w/v), and particularly preferably 0.003% (w/v). More specifically, the content is preferably in a range of 0.0001 to 0.1% (w/v), more preferably 0.0003 to 0.03% (w/v), still more preferably 0.0005 to 0.01% (w/v), yet still more preferably 0.001 to 0.008% (w/v), even still more preferably 0.001 to 0.005% (w/v), and particularly preferably 0.001 to 0.003% (w/v).
• Comparatively small content of the present compound may enable a reduction in amount of a surfactant (typically polyoxyethylene castor oil), which is required to dissolve the present compound, so that the content of the present compound is preferably less than 0.01% (w/v).
• a surfactant typically polyoxyethylene castor oil
• Comparatively small content of the present compound may enable a reduction in amount of a surfactant (typically polyoxyethylene castor oil), which is required to dissolve the present compound, so that the content of the present compound is preferably less than 0.01% (w/v).
• a surfactant typically polyoxyethylene castor oil
• the polyoxyethylene castor oil various polyoxyethylene castor oils each exhibiting different number of polymerization of ethylene oxide.
• the number of polymerization of ethylene oxide is preferably in a range of 5 to 100, more preferably 20 to 50, particularly preferably 30 to 40, and most preferably 35.
• Specific examples of the polyoxyethylene castor oil include polyoxyl 5 castor oil, polyoxyl 9 castor oil, polyoxyl 15 castor oil, polyoxyl 35 castor oil, polyoxyl 40 castor oil, and the like, and polyoxyl 35 castor oil is most preferable.
• polyoxyethylene castor oil as used herein is not polyoxyethylene hardened castor oil (provided that it is not excluded from the present invention that the pharmaceutical composition of the present invention further comprises polyoxyethylene hardened castor oil in the amount which does not exert an adverse influence on stability).
• the content of the polyoxyethylene castor oil is not particularly limited.
• the lower limit is preferably 0.001% (w/v), more preferably 0.01% (w/v), still more preferably 0.1% (w/v), particularly preferably 0.5% (w/v), and most preferably 0.8% (w/v).
• the upper limit is preferably 10% (w/v), more preferably 5% (w/v), still more preferably 4% (w/v), particularly preferably 3% (w/v), and most preferably 2% (w/v).
• the content is preferably in a range of 0.001 to 10% (w/v), more preferably 0.01 to 5% (w/v), still more preferably 0.1 to 4% (w/v), particularly preferably 0.5 to 3% (w/v), and most preferably 0.8 to 2% (w/v).
• the content of the polyoxyethylene castor oil relative to 6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylamino)isopropyl acetate or a salt thereof is not particularly limited.
• the lower limit of the content of the polyoxyethylene castor oil is preferably 1 part by mass, more preferably 10 parts by mass, still more preferably 50 parts by mass, yet still more preferably 100 parts by mass, and particularly preferably 200 parts by mass, relative to 1 part by mass of 6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylamino)isopropyl acetate or a salt thereof.
• the upper limit is preferably 20,000 parts by mass, more preferably 10,000 parts by mass, still more preferably 5,000 parts by mass, yet still more preferably 3,000 parts by mass, and particularly preferably 2,000 parts by mass.
• the content of the polyoxyethylene castor oil is preferably in a range of 1 to 20,000 parts by mass, more preferably 10 to 10,000 parts by mass, still more preferably 50 to 5,000 parts by mass, particularly preferably 100 to 3,000 parts by mass, and most preferably 200 to 2,000 parts by mass, relative to 1 part by mass of 6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylamino)isopropyl acetate or a salt thereof.
• Additives can be optionally used in the pharmaceutical composition of the present invention, and it is possible to add, as additives, a buffer agent, a tonicity agent, a stabilizer, a preservative, an antioxidant, a high molecular weight polymer, and the like.
• the buffer agent which is usable as additives for a pharmaceutical product, in the pharmaceutical composition of the present invention.
• the buffer agent include phosphoric acid or a salt thereof, boric acid or a salt thereof, citric acid or a salt thereof, acetic acid or a salt thereof, carbonic acid or a salt thereof, tartaric acid or a salt thereof, ⁇ -aminocaproic acid, trometamol, and the like.
• the buffer agent is preferably boric acid or a salt thereof, citric acid or a salt thereof, or acetic acid or a salt thereof, and particularly preferably citric acid or a salt thereof.
• Examples of the phosphate include sodium phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, potassium phosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, and the like;
• examples of the borate include borax, sodium borate, potassium borate, and the like;
• examples of the citrate include sodium acetate, disodium citrate, trisodium citrate, and the like;
• examples of the acetate include sodium acetate, potassium acetate, and the like;
• examples of the carbonate include sodium carbonate, sodium hydrogen carbonate, and the like; and examples of the tartrate include sodium tartrate, potassium tartrate, and the like.
• the content of the buffer agent can be appropriately adjusted according to the type of the buffer agent, and is preferably in a range of 0.001 to 10% (w/v), more preferably 0.01 to 5% (w/v), still more preferably 0.1 to 3% (w/v), and most preferably 0.2 to 2% (w/v).
• the tonicity agent which is usable as additives for a pharmaceutical product, in the pharmaceutical composition of the present invention.
• the tonicity agent include an ionic tonicity agent, a nonionic tonicity agent, and the like.
• the ionic tonicity agent include sodium chloride, potassium chloride, calcium chloride, magnesium chloride, and the like; and examples of the nonionic tonicity agent include glycerol, propylene glycol, sorbitol, mannitol, and the like.
• the content of the tonicity agent can be appropriately adjusted according to the type of the tonicity agent, and is preferably in a range of 0.01 to 10% (w/v), more preferably 0.02 to 7% (w/v), still more preferably 0.1 to 5% (w/v), particularly preferably 0.5 to 4% (w/v), and most preferably 0.8 to 3% (w/v).
• the stabilizer which is usable as additives for a pharmaceutical product, in the pharmaceutical composition of the present invention.
• the stabilizer include edetic acid, monosodium edetate, disodium edetate, tetrasodium edetate, sodium citrate, and the like, and disodium edetate is particularly preferable.
• the content of the stabilizer can be appropriately adjusted according to the type of the stabilizer, and is preferably in a range of 0.001 to 1% (w/v), more preferably 0.005 to 0.5% (w/v), still more preferably 0.01 to 0.1% (w/v), and most preferably 0.02 to 0.05% (w/v).
• the preservative which is usable as additives for a pharmaceutical product, in the pharmaceutical composition of the present invention.
• the preservative include benzalkonium chloride, benzalkonium bromide, benzethonium chloride, sorbic acid, potassium sorbate, methyl paraoxybenzoate, propyl paraoxybenzoate, chlorobutanol, and the like. From a viewpoint of stability of 6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylamino)isopropyl acetate or a salt thereof, it is desired not to include sorbic acid.
• the content of the preservative can be appropriately adjusted according to the type of the preservative, and is preferably in a range of 0.0001 to 1% (w/v), more preferably 0.0005 to 0.1% (w/v), still more preferably 0.001 to 0.05% (w/v), and most preferably 0.002 to 0.01% (w/v).
• the antioxidant which is usable as additives for a pharmaceutical product, in the pharmaceutical composition of the present invention.
• the antioxidant include ascorbic acid, tocopherol, dibutylhydroxytoluene, butylhydroxyanisole, sodium erythorbate, propyl gallate, sodium sulfite, and the like.
• the content of the antioxidant can be appropriately adjusted according to the type of the antioxidant, and is preferably in a range of 0.0001 to 1% (w/v), more preferably 0.0005 to 0.1% (w/v), still more preferably 0.001 to 0.02% (w/v), and most preferably 0.005 to 0.010% (w/v).
• the high molecular weight polymer which is usable as additives for a pharmaceutical product, in the pharmaceutical composition of the present invention.
• the high molecular weight polymer include methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethylmethyl cellulose, hydroxypropylmethyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxypropylmethylcellulose acetate succinate, hydroxypropylmethylcellulose phthalate, carboxymethylethyl cellulose, cellulose acetate phthalate, polyvinylpyrrolidone, polyvinyl alcohol, carboxyvinyl polymer, polyethylene glycol, and the like.
• the content of the high molecular weight polymer can be appropriately adjusted according to the type of the high molecular weight polymer, and is preferably in a range of 0.001 to 5% (w/v), more preferably 0.01 to 1% (w/v), and still more preferably 0.1 to 0.5% (w/v).
• the pH of the pharmaceutical composition of the present invention is preferably in a range of 4.0 to 8.0, more preferably 4.5 to 7.5, and most preferably 5.0 to 7.0.
• the pharmaceutical composition of the present invention can be stored in a container made of various raw materials.
• a container made of various raw materials For example, it is possible to use containers made of polyethylene, polypropylene, and the like. From a viewpoint of ease of instillation (hardness of container) and stability of the present compound, it is preferred to store in a container made of polyethylene.
• the dosage form of the pharmaceutical composition of the present invention is not particularly limited as long as it is usable as a pharmaceutical product.
• Examples of the dosage form include eye drop, ophthalmic injection, and the like, and eye drop is particularly preferable. They can be produced in accordance with a conventional method in the technical field.
• the pharmaceutical composition of the present invention is basically a solution, and a solvent or dispersion medium thereof is preferably water.
• the pharmaceutical composition of the present invention is useful for prevention or treatment of glaucoma or ocular hypertension, or for reduction of intraocular pressure.
• glaucoma in the present invention include primary open-angle glaucoma, secondary open-angle glaucoma, normal tension glaucoma, hypersecretion glaucoma, primary closed-angle glaucoma, secondary closed-angle glaucoma, plateau iris glaucoma, mixed glaucoma, developmental glaucoma, steroid glaucoma, exfoliation glaucoma, amyloid glaucoma, neovascular glaucoma, malignant glaucoma, capsular glaucoma, plateau iris syndrome, and the like.
• the pharmaceutical composition of the present invention may comprise one or plurality of, preferably 1 to 3 of, and more preferably one or two other glaucoma or ocular hypertension therapeutic agent(s) or intraocular tension depressor(s).
• the other glaucoma therapeutic agents is not particularly limited.
• the other glaucoma therapeutic agent is preferably a commercially available glaucoma therapeutic agent or a glaucoma therapeutic agent under development, more preferably a commercially available glaucoma therapeutic agent, and particularly preferably a commercially available glaucoma therapeutic agent whose mechanism of action is different from that of the present compound.
• non-selective sympathomimetic agent an ⁇ 2 receptor agonist, an ⁇ 1 receptor antagonist, a ⁇ receptor antagonist, a parasympatholytic agent, a carbonate dehydratase inhibitor, prostaglandins, a Rho kinase inhibitor, and the like.
• non-selective sympathomimetic agent examples include dipivefrin; specific examples of the ⁇ 2 receptor agonist include brimonidine and apraclonidine; specific examples of the ⁇ 1 receptor antagonist include bunazosin; specific examples of the ⁇ receptor antagonist include timolol, befunolol, carteolol, nipradilol, betaxolol, levobunolol, and metipranolol; specific examples of the parasympatholytic agent include pilocarpine; specific examples of the carbonate dehydratase inhibitor include dorzolamide, brinzolamide, and acetazolamide; specific examples of prostaglandins include latanoprost, isopropyl unoprostone, bimatoprost, and travoprost; and specific examples of the Rho kinase inhibitor include ripasudil.
• Typical Formulation Examples using the present compound will be shown below.
• the mixing amount of each component is the content in 100 mL of the composition.
• Types and mixing amounts of the present compound, polyoxyethylene castor oil, and additives in Formulation Examples 1 to 3 can be appropriately adjusted to obtain desired compositions.
• Example 1 To 5 g of polyoxyl 35 castor oil, 20 mL of a 10% sodium dihydrogen phosphate solution and 900 mL of purified water were added. After adjusting the pH to about 6 by adding a sodium hydroxide solution or dilute hydrochloric acid (q.s.), 0.003 g of isopropyl (6- ⁇ [4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl ⁇ pyridin-2-ylaminolacetate (hereinafter also referred to as the compound A) was added and dissolved. To this was added purified water (q.s.) to make 1,000 mL in total, thus preparing a formulation of Example 1.
• purified water q.s.
• Example 2 Present compound A 0.0003 0.0003 0.0003 Polyoxyl 35 castor oil 0.5 — — Polyoxyethylene hardened — 0.5 — castor oil 60
• Polysorbate 80 — — 0.5 Sodium dihydrogen 0.2 0.2 0.2 phosphate HCl/NaOH q.s. q.s. q.s. Purified water q.s. q.s. q.s. pH 6 6 6 Remaining 60° C./ 96.4 24.2 69.5 rate (%) 1 week 60° C./ 71.7 ND ND 4 weeks ND: no data
• Example 1 maintained significantly high remaining rate at 60° C. over 4 weeks, as compared with the formulations of Comparative Examples 1 and 2.
• Example 7 Present compound A 0.01 0.01 0.0003 0.001 0.01 0.03 Polyoxyl 35 castor 0.8 0.8 0.5 0.8 2 2 oil Sodium dihydrogen 0.2 0.2 0.2 0.2 0.2 0.2 phosphate Sodium edetate 0.01 — 0.05 0.05 0.05 0.05 hydrate Glycerol 2.3 2.3 — 2.3 2.3 2.3 Benzalkonium 0.004 0.004 — 0.004 0.004 0.00 chloride HCl/NaOH q.s. q.s. q.s. q.s. q.s. q.s. q.s. Purified water q.s. q.s. q.s.

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