DE2146440A1 - 4,8-dihydroxy-2,6-dimercaptopyrimido (5,4-d)-pyrimidine prepn - start from s-alkylisothiourea and oxalacetic ester - Google Patents
4,8-dihydroxy-2,6-dimercaptopyrimido (5,4-d)-pyrimidine prepn - start from s-alkylisothiourea and oxalacetic esterInfo
- Publication number
- DE2146440A1 DE2146440A1 DE19712146440 DE2146440A DE2146440A1 DE 2146440 A1 DE2146440 A1 DE 2146440A1 DE 19712146440 DE19712146440 DE 19712146440 DE 2146440 A DE2146440 A DE 2146440A DE 2146440 A1 DE2146440 A1 DE 2146440A1
- Authority
- DE
- Germany
- Prior art keywords
- formula
- product
- amino
- mixture
- added
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- HNTHPSUIOUUVCO-UHFFFAOYSA-N 2,6-bis(sulfanylidene)-1,5-dihydropyrimido[5,4-d]pyrimidine-4,8-dione Chemical compound N1C(=S)NC(=O)C2=C1C(=O)NC(=S)N2 HNTHPSUIOUUVCO-UHFFFAOYSA-N 0.000 title claims description 4
- JDXYSCUOABNLIR-UHFFFAOYSA-N diethyl 2-oxobutanedioate Chemical compound CCOC(=O)CC(=O)C(=O)OCC JDXYSCUOABNLIR-UHFFFAOYSA-N 0.000 title 1
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 10
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 39
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 33
- 150000001875 compounds Chemical class 0.000 claims description 25
- 150000001408 amides Chemical class 0.000 claims description 21
- -1 oxaloacetic acid ester Chemical class 0.000 claims description 16
- 229910021529 ammonia Inorganic materials 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 6
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 125000003396 thiol group Chemical group [H]S* 0.000 claims description 4
- 125000003277 amino group Chemical group 0.000 claims description 3
- 125000004429 atom Chemical group 0.000 claims description 2
- KUNJCDLYLFYWRU-UHFFFAOYSA-N 5-amino-2,4-dioxo-1h-pyrimidine-6-carboxamide Chemical class NC(=O)C=1NC(=O)NC(=O)C=1N KUNJCDLYLFYWRU-UHFFFAOYSA-N 0.000 claims 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims 1
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 abstract description 8
- 229960005010 orotic acid Drugs 0.000 abstract description 3
- 229940124549 vasodilator Drugs 0.000 abstract description 3
- 239000003071 vasodilator agent Substances 0.000 abstract description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-M hydrosulfide Chemical compound [SH-] RWSOTUBLDIXVET-UHFFFAOYSA-M 0.000 abstract description 2
- 150000001340 alkali metals Chemical group 0.000 abstract 2
- PXQPEWDEAKTCGB-UHFFFAOYSA-N vitamin B13 Natural products OC(=O)C1=CC(=O)NC(=O)N1 PXQPEWDEAKTCGB-UHFFFAOYSA-N 0.000 abstract 2
- 230000002140 halogenating effect Effects 0.000 abstract 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 54
- 239000000047 product Substances 0.000 description 40
- 239000000203 mixture Substances 0.000 description 39
- 239000013078 crystal Substances 0.000 description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 25
- 229960000583 acetic acid Drugs 0.000 description 20
- 238000006243 chemical reaction Methods 0.000 description 20
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 16
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 14
- 235000011114 ammonium hydroxide Nutrition 0.000 description 14
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 12
- 239000002253 acid Substances 0.000 description 12
- 239000007795 chemical reaction product Substances 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- 239000007858 starting material Substances 0.000 description 12
- 238000000921 elemental analysis Methods 0.000 description 11
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 10
- 239000000706 filtrate Substances 0.000 description 10
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 239000002244 precipitate Substances 0.000 description 10
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 6
- 239000012362 glacial acetic acid Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- SOIFLUNRINLCBN-UHFFFAOYSA-N ammonium thiocyanate Chemical compound [NH4+].[S-]C#N SOIFLUNRINLCBN-UHFFFAOYSA-N 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 125000004119 disulfanediyl group Chemical group *SS* 0.000 description 5
- NNBBQNFHCVVQHZ-UHFFFAOYSA-N methyl carbamimidothioate;sulfuric acid Chemical compound CSC(N)=N.OS(O)(=O)=O NNBBQNFHCVVQHZ-UHFFFAOYSA-N 0.000 description 5
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 5
- 238000001953 recrystallisation Methods 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- 150000002148 esters Chemical class 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- JOZPEVMCAKXSEY-UHFFFAOYSA-N pyrimido[5,4-d]pyrimidine Chemical group N1=CN=CC2=NC=NC=C21 JOZPEVMCAKXSEY-UHFFFAOYSA-N 0.000 description 4
- 239000011541 reaction mixture Substances 0.000 description 4
- 238000010992 reflux Methods 0.000 description 4
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 description 4
- 159000000000 sodium salts Chemical class 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- IZEKFCXSFNUWAM-UHFFFAOYSA-N dipyridamole Chemical compound C=12N=C(N(CCO)CCO)N=C(N3CCCCC3)C2=NC(N(CCO)CCO)=NC=1N1CCCCC1 IZEKFCXSFNUWAM-UHFFFAOYSA-N 0.000 description 3
- 229960002768 dipyridamole Drugs 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 125000005843 halogen group Chemical group 0.000 description 3
- 238000002329 infrared spectrum Methods 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- JCBJVAJGLKENNC-UHFFFAOYSA-M potassium ethyl xanthate Chemical compound [K+].CCOC([S-])=S JCBJVAJGLKENNC-UHFFFAOYSA-M 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- KYLIZBIRMBGUOP-UHFFFAOYSA-N Anetholtrithion Chemical group C1=CC(OC)=CC=C1C1=CC(=S)SS1 KYLIZBIRMBGUOP-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 238000005576 amination reaction Methods 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000012043 crude product Substances 0.000 description 2
- NBGTWXBPCIHUQD-UHFFFAOYSA-N diethylcarbamodithioic acid;n-ethylethanamine Chemical compound CCNCC.CCN(CC)C(S)=S NBGTWXBPCIHUQD-UHFFFAOYSA-N 0.000 description 2
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000026030 halogenation Effects 0.000 description 2
- 238000005658 halogenation reaction Methods 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000012991 xanthate Substances 0.000 description 2
- CXJNNMFPXAHDPF-REOHCLBHSA-N (S)-2-methyl-3-oxosuccinic acid Chemical compound OC(=O)[C@@H](C)C(=O)C(O)=O CXJNNMFPXAHDPF-REOHCLBHSA-N 0.000 description 1
- YIQIENHQATXFFQ-UHFFFAOYSA-N 2,6-dichloro-1,5-dihydropyrimido[5,4-d]pyrimidine-4,8-dione Chemical compound N1C(Cl)=NC(=O)C2=C1C(=O)N=C(Cl)N2 YIQIENHQATXFFQ-UHFFFAOYSA-N 0.000 description 1
- WJFDCFHWFHCLIW-UHFFFAOYSA-N 2-(bromomethyl)-6-methylpyridine Chemical compound CC1=CC=CC(CBr)=N1 WJFDCFHWFHCLIW-UHFFFAOYSA-N 0.000 description 1
- HWCXJKLFOSBVLH-UHFFFAOYSA-N 5-amino-2,4-dioxo-1h-pyrimidine-6-carboxylic acid Chemical compound NC1=C(C(O)=O)NC(=O)NC1=O HWCXJKLFOSBVLH-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- APRJFNLVTJWEPP-UHFFFAOYSA-N Diethylcarbamic acid Chemical compound CCN(CC)C(O)=O APRJFNLVTJWEPP-UHFFFAOYSA-N 0.000 description 1
- 208000035126 Facies Diseases 0.000 description 1
- LOMVENUNSWAXEN-UHFFFAOYSA-N Methyl oxalate Chemical compound COC(=O)C(=O)OC LOMVENUNSWAXEN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 1
- WDJHALXBUFZDSR-UHFFFAOYSA-M acetoacetate Chemical compound CC(=O)CC([O-])=O WDJHALXBUFZDSR-UHFFFAOYSA-M 0.000 description 1
- 125000004414 alkyl thio group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical group NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000007810 chemical reaction solvent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 210000004351 coronary vessel Anatomy 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- WREDNSAXDZCLCP-UHFFFAOYSA-N methanedithioic acid Chemical compound SC=S WREDNSAXDZCLCP-UHFFFAOYSA-N 0.000 description 1
- 150000004682 monohydrates Chemical class 0.000 description 1
- WWECJGLXBSQKRF-UHFFFAOYSA-N n,n-dimethylformamide;methanol Chemical compound OC.CN(C)C=O WWECJGLXBSQKRF-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- JHXPCSYIECUNMQ-UHFFFAOYSA-M potassium methanedithioate Chemical compound [K+].[S-]C=S JHXPCSYIECUNMQ-UHFFFAOYSA-M 0.000 description 1
- ZFCHNZDUMIOWFV-UHFFFAOYSA-N pyrimidine-2-carboxylic acid Chemical class OC(=O)C1=NC=CC=N1 ZFCHNZDUMIOWFV-UHFFFAOYSA-N 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- LMBFAGIMSUYTBN-MPZNNTNKSA-N teixobactin Chemical compound C([C@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H](CCC(N)=O)C(=O)N[C@H]([C@@H](C)CC)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H]1C(N[C@@H](C)C(=O)N[C@@H](C[C@@H]2NC(=N)NC2)C(=O)N[C@H](C(=O)O[C@H]1C)[C@@H](C)CC)=O)NC)C1=CC=CC=C1 LMBFAGIMSUYTBN-MPZNNTNKSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
- C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
- C07D239/56—One oxygen atom and one sulfur atom
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
- C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
- C07D487/04—Ortho-condensed systems
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
- Plural Heterocyclic Compounds (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11350270A JPS5040B1 (enrdf_load_stackoverflow) | 1970-12-17 | 1970-12-17 | |
| JP46006755A JPS5116428B1 (enrdf_load_stackoverflow) | 1971-02-17 | 1971-02-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2146440A1 true DE2146440A1 (en) | 1972-07-06 |
Family
ID=26340957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19712146440 Pending DE2146440A1 (en) | 1970-12-17 | 1971-09-16 | 4,8-dihydroxy-2,6-dimercaptopyrimido (5,4-d)-pyrimidine prepn - start from s-alkylisothiourea and oxalacetic ester |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA931567A (enrdf_load_stackoverflow) |
| DE (1) | DE2146440A1 (enrdf_load_stackoverflow) |
| DK (1) | DK134067B (enrdf_load_stackoverflow) |
| NO (1) | NO133234C (enrdf_load_stackoverflow) |
| SE (1) | SE384681B (enrdf_load_stackoverflow) |
-
1971
- 1971-08-11 CA CA120471A patent/CA931567A/en not_active Expired
- 1971-09-16 DE DE19712146440 patent/DE2146440A1/de active Pending
- 1971-11-01 SE SE1386171A patent/SE384681B/xx unknown
- 1971-11-24 DK DK574571A patent/DK134067B/da unknown
- 1971-12-15 NO NO462371A patent/NO133234C/no unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NO133234C (enrdf_load_stackoverflow) | 1976-03-31 |
| DK134067B (da) | 1976-09-06 |
| DK134067C (enrdf_load_stackoverflow) | 1977-02-07 |
| SE384681B (sv) | 1976-05-17 |
| CA931567A (en) | 1973-08-07 |
| NO133234B (enrdf_load_stackoverflow) | 1975-12-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OHA | Expiration of time for request for examination |