Filtrerade sökresultat
3,5-Difluoropyridine-2-carboxylic acid, 97%
CAS: 745784-04-7 Molekylformel: C6H3F2NO2 Molekylvikt (g/mol): 159.09 MDL-nummer: MFCD05664124 InChI-nyckel: QKLXAJQKMIWFRC-UHFFFAOYSA-N Synonym: 3,5-difluoropicolinic acid,3,5-difluoro-2-pyridinecarboxylic acid,2-pyridinecarboxylic acid, 3,5-difluoro,3,5-difluoro-2-pyridinecarboxylicacid,3,5-difluoropicolinicacid,acmc-209ov6,2-carboxy-3,5-difluoropyridine,2-pyridinecarboxylicacid, 3,5-difluoro,3,5-difluoro-pyridine-2-carboxylic acid,3 pound not5-difluoropyridine-2-carboxylicacid PubChem CID: 2783262 IUPAC-namn: 3,5-difluoropyridine-2-carboxylic acid LEDER: OC(=O)C1=C(F)C=C(F)C=N1
| Molekylformel | C6H3F2NO2 |
|---|---|
| PubChem CID | 2783262 |
| MDL-nummer | MFCD05664124 |
| IUPAC-namn | 3,5-difluoropyridine-2-carboxylic acid |
| CAS | 745784-04-7 |
| InChI-nyckel | QKLXAJQKMIWFRC-UHFFFAOYSA-N |
| LEDER | OC(=O)C1=C(F)C=C(F)C=N1 |
| Molekylvikt (g/mol) | 159.09 |
| Synonym | 3,5-difluoropicolinic acid,3,5-difluoro-2-pyridinecarboxylic acid,2-pyridinecarboxylic acid, 3,5-difluoro,3,5-difluoro-2-pyridinecarboxylicacid,3,5-difluoropicolinicacid,acmc-209ov6,2-carboxy-3,5-difluoropyridine,2-pyridinecarboxylicacid, 3,5-difluoro,3,5-difluoro-pyridine-2-carboxylic acid,3 pound not5-difluoropyridine-2-carboxylicacid |
3-Chloro-4-hydroxypyridine, 98%
CAS: 89284-20-8 Molekylformel: C5H4ClNO Molekylvikt (g/mol): 129.54 MDL-nummer: MFCD04114248 InChI-nyckel: NKEYLLFRPHHBOQ-UHFFFAOYSA-N Synonym: 3-chloro-4-hydroxypyridine,3-chloropyridin-4-ol,4-pyridinol, 3-chloro,3-chloropyridin-4 1h-one,3-chloro-4-hydroxy pyridine,pubchem6680,3-chloro-4-pyridinol,3-chloropyridine-4-ol,acmc-20a0ep,4 1h-pyridinone,3-chloro PubChem CID: 2762929 IUPAC-namn: 3-chloro-1H-pyridin-4-one LEDER: ClC1=CNC=CC1=O
| Molekylformel | C5H4ClNO |
|---|---|
| PubChem CID | 2762929 |
| MDL-nummer | MFCD04114248 |
| IUPAC-namn | 3-chloro-1H-pyridin-4-one |
| CAS | 89284-20-8 |
| InChI-nyckel | NKEYLLFRPHHBOQ-UHFFFAOYSA-N |
| LEDER | ClC1=CNC=CC1=O |
| Molekylvikt (g/mol) | 129.54 |
| Synonym | 3-chloro-4-hydroxypyridine,3-chloropyridin-4-ol,4-pyridinol, 3-chloro,3-chloropyridin-4 1h-one,3-chloro-4-hydroxy pyridine,pubchem6680,3-chloro-4-pyridinol,3-chloropyridine-4-ol,acmc-20a0ep,4 1h-pyridinone,3-chloro |
4-trifluormetyl-1H-pyrazol, 97 %, Thermo Scientific Chemicals
CAS: 52222-73-8 Molekylformel: C4H3F3N2 Molekylvikt (g/mol): 136.077 MDL-nummer: MFCD11226572 InChI-nyckel: KDEJQUNODYXYBJ-UHFFFAOYSA-N Synonym: 4-trifluoromethyl-1h-pyrazole,1h-pyrazole, 4-trifluoromethyl,4-trifluoromethylpyrazole,4-trifluoromethyl pyrazole,4-trifluoromethyl-1 h-pyrazole,4-trifluoromethyl ;-1h-pyrazole PubChem CID: 12777795 IUPAC-namn: 4-(trifluoromethyl)-1H-pyrazole LEDER: C1=C(C=NN1)C(F)(F)F
| Molekylformel | C4H3F3N2 |
|---|---|
| PubChem CID | 12777795 |
| MDL-nummer | MFCD11226572 |
| IUPAC-namn | 4-(trifluoromethyl)-1H-pyrazole |
| CAS | 52222-73-8 |
| InChI-nyckel | KDEJQUNODYXYBJ-UHFFFAOYSA-N |
| LEDER | C1=C(C=NN1)C(F)(F)F |
| Molekylvikt (g/mol) | 136.077 |
| Synonym | 4-trifluoromethyl-1h-pyrazole,1h-pyrazole, 4-trifluoromethyl,4-trifluoromethylpyrazole,4-trifluoromethyl pyrazole,4-trifluoromethyl-1 h-pyrazole,4-trifluoromethyl ;-1h-pyrazole |
3-(2-Benzothiazolyl)aniline, 96%
CAS: 41230-21-1 Molekylformel: C13H10N2S Molekylvikt (g/mol): 226.297 MDL-nummer: MFCD00579111 InChI-nyckel: MKMRZZJJDIBAJF-UHFFFAOYSA-N Synonym: 3-benzothiazol-2-yl-phenylamine,3-1,3-benzothiazol-2-yl aniline,3-benzothiazol-2-ylphenylamine,benzenamine,3-2-benzothiazolyl,cambridge id 5250055,3-2-benzothiazolyl aniline,3-benzothiazol-2-yl aniline,3-benzo d thiazol-2-yl aniline,3-benzothiazol-2-yl benzenamine,3-1,3-benzothiazol-2-yl phenyl amine PubChem CID: 720999 IUPAC-namn: 3-(1,3-benzothiazol-2-yl)aniline LEDER: C1=CC=C2C(=C1)N=C(S2)C3=CC(=CC=C3)N
| Molekylformel | C13H10N2S |
|---|---|
| PubChem CID | 720999 |
| MDL-nummer | MFCD00579111 |
| IUPAC-namn | 3-(1,3-benzothiazol-2-yl)aniline |
| CAS | 41230-21-1 |
| InChI-nyckel | MKMRZZJJDIBAJF-UHFFFAOYSA-N |
| LEDER | C1=CC=C2C(=C1)N=C(S2)C3=CC(=CC=C3)N |
| Molekylvikt (g/mol) | 226.297 |
| Synonym | 3-benzothiazol-2-yl-phenylamine,3-1,3-benzothiazol-2-yl aniline,3-benzothiazol-2-ylphenylamine,benzenamine,3-2-benzothiazolyl,cambridge id 5250055,3-2-benzothiazolyl aniline,3-benzothiazol-2-yl aniline,3-benzo d thiazol-2-yl aniline,3-benzothiazol-2-yl benzenamine,3-1,3-benzothiazol-2-yl phenyl amine |
(R)-2-(Aminomethyl)-1-ethylpyrrolidine, 97%
CAS: 22795-97-7 Molekylformel: C7H16N2 Molekylvikt (g/mol): 128.22 MDL-nummer: MFCD00671482 InChI-nyckel: UNRBEYYLYRXYCG-SSDOTTSWSA-N Synonym: r-1-ethylpyrrolidin-2-yl methanamine,r-+-2-aminomethyl-1-ethylpyrrolidine,r-2-aminomethyl-1-ethylpyrrolidine,2r-1-ethylpyrrolidin-2-yl methanamine,2-pyrrolidinemethanamine, 1-ethyl-, 2r,2r-1-ethyl-2-pyrrolidinemethanamine,1-ethyl-2-pyrrolidinyl methanamine #,pubchem11067,r-+-2-aminomethyl-n-ethylpyrrolidine PubChem CID: 854138 IUPAC-namn: [(2R)-1-ethylpyrrolidin-2-yl]methanamine LEDER: CCN1CCCC1CN
| Molekylformel | C7H16N2 |
|---|---|
| PubChem CID | 854138 |
| MDL-nummer | MFCD00671482 |
| IUPAC-namn | [(2R)-1-ethylpyrrolidin-2-yl]methanamine |
| CAS | 22795-97-7 |
| InChI-nyckel | UNRBEYYLYRXYCG-SSDOTTSWSA-N |
| LEDER | CCN1CCCC1CN |
| Molekylvikt (g/mol) | 128.22 |
| Synonym | r-1-ethylpyrrolidin-2-yl methanamine,r-+-2-aminomethyl-1-ethylpyrrolidine,r-2-aminomethyl-1-ethylpyrrolidine,2r-1-ethylpyrrolidin-2-yl methanamine,2-pyrrolidinemethanamine, 1-ethyl-, 2r,2r-1-ethyl-2-pyrrolidinemethanamine,1-ethyl-2-pyrrolidinyl methanamine #,pubchem11067,r-+-2-aminomethyl-n-ethylpyrrolidine |
2-Bromo-4-nitropyridine N-oxide, 97%
CAS: 52092-43-0 Molekylformel: C5H3BrN2O3 Molekylvikt (g/mol): 218.99 MDL-nummer: MFCD00160743 InChI-nyckel: IRBDHXCXCSFNEQ-UHFFFAOYSA-N Synonym: 2-bromo-4-nitropyridine 1-oxide,2-bromo-4-nitropyridine n-oxide,2-bromo-4-nitropyridine-n-oxide,2-bromo-4-nitropyridin-1-ium-1-olate,pyridine, 2-bromo-4-nitro-, 1-oxide,2-bromo-4-nitropyridine1-oxide,2-bromo-4-nitropyridine oxide,2-bromo-4-nitropyridin-1-ol,pubchem5958,acmc-1astu PubChem CID: 3904026 LEDER: [O-][N+](=O)C1=CC=[N+]([O-])C(Br)=C1
| Molekylformel | C5H3BrN2O3 |
|---|---|
| PubChem CID | 3904026 |
| MDL-nummer | MFCD00160743 |
| CAS | 52092-43-0 |
| InChI-nyckel | IRBDHXCXCSFNEQ-UHFFFAOYSA-N |
| LEDER | [O-][N+](=O)C1=CC=[N+]([O-])C(Br)=C1 |
| Molekylvikt (g/mol) | 218.99 |
| Synonym | 2-bromo-4-nitropyridine 1-oxide,2-bromo-4-nitropyridine n-oxide,2-bromo-4-nitropyridine-n-oxide,2-bromo-4-nitropyridin-1-ium-1-olate,pyridine, 2-bromo-4-nitro-, 1-oxide,2-bromo-4-nitropyridine1-oxide,2-bromo-4-nitropyridine oxide,2-bromo-4-nitropyridin-1-ol,pubchem5958,acmc-1astu |
2-Bromo-3-methyl-5-nitropyridine, 97%
CAS: 23132-21-0 Molekylformel: C6H5BrN2O2 Molekylvikt (g/mol): 217.022 MDL-nummer: MFCD03095065 InChI-nyckel: FZIQHPKXSLHGBZ-UHFFFAOYSA-N Synonym: 2-bromo-5-nitro-3-picoline,2-bromo-3-methyl-5-nitro-pyridine,pyridine, 2-bromo-3-methyl-5-nitro,2-hydroxy-5-nitro-3-picoline 2-hydroxy-3-methyl-5-nitropyridine,pubchem10608,acmc-209g1c,ksc496c3r,fziqhpkxslhgbz-uhfffaoysa,2-bromo-3-methyl-5-nitro pyridine,2-bromanyl-3-methyl-5-nitro-pyridine PubChem CID: 5200466 IUPAC-namn: 2-bromo-3-methyl-5-nitropyridine LEDER: CC1=CC(=CN=C1Br)[N+](=O)[O-]
| Molekylformel | C6H5BrN2O2 |
|---|---|
| PubChem CID | 5200466 |
| MDL-nummer | MFCD03095065 |
| IUPAC-namn | 2-bromo-3-methyl-5-nitropyridine |
| CAS | 23132-21-0 |
| InChI-nyckel | FZIQHPKXSLHGBZ-UHFFFAOYSA-N |
| LEDER | CC1=CC(=CN=C1Br)[N+](=O)[O-] |
| Molekylvikt (g/mol) | 217.022 |
| Synonym | 2-bromo-5-nitro-3-picoline,2-bromo-3-methyl-5-nitro-pyridine,pyridine, 2-bromo-3-methyl-5-nitro,2-hydroxy-5-nitro-3-picoline 2-hydroxy-3-methyl-5-nitropyridine,pubchem10608,acmc-209g1c,ksc496c3r,fziqhpkxslhgbz-uhfffaoysa,2-bromo-3-methyl-5-nitro pyridine,2-bromanyl-3-methyl-5-nitro-pyridine |
(R)-(+)-N-BOC-2-Piperidinecarboxylic acid, 98%
CAS: 28697-17-8 Molekylformel: C11H19NO4 Molekylvikt (g/mol): 229.27 MDL-nummer: MFCD00237380 InChI-nyckel: JQAOHGMPAAWWQO-MRVPVSSYSA-N Synonym: r-+-n-boc-2-piperidinecarboxylic acid,boc-d-hopro-oh,boc-d-pipecolic acid,r-1-tert-butoxycarbonyl piperidine-2-carboxylic acid,boc-d-pip-oh,d-n-boc-pipecolic acid,r-1-n-boc-pipecolinic acid,r-n-boc-piperidine-2-carboxylic acid,+-n-boc-r-pipecolinic acid,r-n-boc-2-piperidinecarboxylic acid PubChem CID: 688618 IUPAC-namn: (2R)-1-[(2-methylpropan-2-yl)oxycarbonyl]piperidine-2-carboxylic acid LEDER: CC(C)(C)OC(=O)N1CCCCC1C(=O)O
| Molekylformel | C11H19NO4 |
|---|---|
| PubChem CID | 688618 |
| MDL-nummer | MFCD00237380 |
| IUPAC-namn | (2R)-1-[(2-methylpropan-2-yl)oxycarbonyl]piperidine-2-carboxylic acid |
| CAS | 28697-17-8 |
| InChI-nyckel | JQAOHGMPAAWWQO-MRVPVSSYSA-N |
| LEDER | CC(C)(C)OC(=O)N1CCCCC1C(=O)O |
| Molekylvikt (g/mol) | 229.27 |
| Synonym | r-+-n-boc-2-piperidinecarboxylic acid,boc-d-hopro-oh,boc-d-pipecolic acid,r-1-tert-butoxycarbonyl piperidine-2-carboxylic acid,boc-d-pip-oh,d-n-boc-pipecolic acid,r-1-n-boc-pipecolinic acid,r-n-boc-piperidine-2-carboxylic acid,+-n-boc-r-pipecolinic acid,r-n-boc-2-piperidinecarboxylic acid |
(+/-)-1-Benzyloxycarbonyl-4-Boc-piperazine-2-carboxylic acid, 97%
CAS: 126937-41-5 Molekylformel: C18H24N2O6 Molekylvikt (g/mol): 364.398 MDL-nummer: MFCD01631192 InChI-nyckel: MKXMXZZARNRMMQ-UHFFFAOYSA-N Synonym: n-4-boc-n-1-cbz-2-piperazine carboxylic acid,4-boc-1-cbz-2-piperazinecarboxylic acid,1-benzyloxy carbonyl-4-tert-butoxycarbonyl piperazine-2-carboxylic acid,4-boc-1-cbz-2-piperazinecarboxylicacid,1-benzyloxycarbonyl-4-tert-butoxycarbonyl piperazine-2-carboxylic acid,4-boc-1-cbz-piperazine-2-carboxylic acid,4-n-boc-1-n-cbz-piperazine-2-carboxylic acid,n-1-boc-n-4-cbz-2-piperazinecarboxylic acid t-butyl ester,+/--1-benzyloxycarbonyl-4-boc-piperazine-2-carboxylic acid PubChem CID: 2756777 IUPAC-namn: 4-[(2-methylpropan-2-yl)oxycarbonyl]-1-phenylmethoxycarbonylpiperazine-2-carboxylic acid LEDER: CC(C)(C)OC(=O)N1CCN(C(C1)C(=O)O)C(=O)OCC2=CC=CC=C2
| Molekylformel | C18H24N2O6 |
|---|---|
| PubChem CID | 2756777 |
| MDL-nummer | MFCD01631192 |
| IUPAC-namn | 4-[(2-methylpropan-2-yl)oxycarbonyl]-1-phenylmethoxycarbonylpiperazine-2-carboxylic acid |
| CAS | 126937-41-5 |
| InChI-nyckel | MKXMXZZARNRMMQ-UHFFFAOYSA-N |
| LEDER | CC(C)(C)OC(=O)N1CCN(C(C1)C(=O)O)C(=O)OCC2=CC=CC=C2 |
| Molekylvikt (g/mol) | 364.398 |
| Synonym | n-4-boc-n-1-cbz-2-piperazine carboxylic acid,4-boc-1-cbz-2-piperazinecarboxylic acid,1-benzyloxy carbonyl-4-tert-butoxycarbonyl piperazine-2-carboxylic acid,4-boc-1-cbz-2-piperazinecarboxylicacid,1-benzyloxycarbonyl-4-tert-butoxycarbonyl piperazine-2-carboxylic acid,4-boc-1-cbz-piperazine-2-carboxylic acid,4-n-boc-1-n-cbz-piperazine-2-carboxylic acid,n-1-boc-n-4-cbz-2-piperazinecarboxylic acid t-butyl ester,+/--1-benzyloxycarbonyl-4-boc-piperazine-2-carboxylic acid |
Imidazo[1,2-a]pyridine-2-carboxylic acid monohydrate, 97%
CAS: 64951-08-2 Molekylformel: C8H6N2O2 Molekylvikt (g/mol): 162.15 MDL-nummer: MFCD03419462 InChI-nyckel: WQLJLPDGSLZYEP-UHFFFAOYSA-N Synonym: imidazo 1,2-a pyridine-2-carboxylic acid,imidazo 1,2-a pyridine-2-carboxylicacid,h-imidazo 1,2-a pyridine-2-carboxylic acid,4-hydroimidazo 1,2-a pyridine-2-carboxylic acid,imidazo 1,2-a pyridine-2-carboxylic,1h-imidazo 1,2-a pyridine-2-carboxylic acid,imidazo 1,2-a pyridine-2-carboxylic acid, technical grade PubChem CID: 2062168 IUPAC-namn: imidazo[1,2-a]pyridine-2-carboxylic acid LEDER: OC(=O)C1=CN2C=CC=CC2=N1
| Molekylformel | C8H6N2O2 |
|---|---|
| PubChem CID | 2062168 |
| MDL-nummer | MFCD03419462 |
| IUPAC-namn | imidazo[1,2-a]pyridine-2-carboxylic acid |
| CAS | 64951-08-2 |
| InChI-nyckel | WQLJLPDGSLZYEP-UHFFFAOYSA-N |
| LEDER | OC(=O)C1=CN2C=CC=CC2=N1 |
| Molekylvikt (g/mol) | 162.15 |
| Synonym | imidazo 1,2-a pyridine-2-carboxylic acid,imidazo 1,2-a pyridine-2-carboxylicacid,h-imidazo 1,2-a pyridine-2-carboxylic acid,4-hydroimidazo 1,2-a pyridine-2-carboxylic acid,imidazo 1,2-a pyridine-2-carboxylic,1h-imidazo 1,2-a pyridine-2-carboxylic acid,imidazo 1,2-a pyridine-2-carboxylic acid, technical grade |
5-Amino-1,2,4-thiadiazole, 97%
CAS: 7552-07-0 Molekylformel: C2H3N3S Molekylvikt (g/mol): 101.13 InChI-nyckel: VJHTZTZXOKVQRN-UHFFFAOYSA-N Synonym: 5-amino-1,2,4-thiadiazole,1,2,4-thiadiazol-5-ylamine,1,2,4-thiadiazole-5-ylamine,1,2,4-thiadiazole, 5-amino,pubchem11136,acmc-1blyp,1,2,4-thiadiazole-5-amine,1,4-thiadiazole, 5-amino,2-amino-1,3,5-thiadiazole,5-imino-1,2,4-thiadiazole PubChem CID: 290274 IUPAC-namn: 1,2,4-thiadiazol-5-amine LEDER: C1=NSC(=N1)N
| Molekylformel | C2H3N3S |
|---|---|
| PubChem CID | 290274 |
| IUPAC-namn | 1,2,4-thiadiazol-5-amine |
| CAS | 7552-07-0 |
| InChI-nyckel | VJHTZTZXOKVQRN-UHFFFAOYSA-N |
| LEDER | C1=NSC(=N1)N |
| Molekylvikt (g/mol) | 101.13 |
| Synonym | 5-amino-1,2,4-thiadiazole,1,2,4-thiadiazol-5-ylamine,1,2,4-thiadiazole-5-ylamine,1,2,4-thiadiazole, 5-amino,pubchem11136,acmc-1blyp,1,2,4-thiadiazole-5-amine,1,4-thiadiazole, 5-amino,2-amino-1,3,5-thiadiazole,5-imino-1,2,4-thiadiazole |
1-(2-Methoxyethyl)piperazine, 98%
CAS: 13484-40-7 Molekylformel: C7H16N2O Molekylvikt (g/mol): 144.21 MDL-nummer: MFCD00191214 InChI-nyckel: BMEMBBFDTYHTLH-UHFFFAOYSA-N Synonym: 1-2-methoxyethyl piperazine,1-2-methoxyethyl-piperazine,1-2-methoxy-ethyl-piperazine,piperazine, 1-2-methoxyethyl,1-methoxy-2-piperazinylethane,pubchem14209,2-methoxyethylpiperazine,n-methoxyethyl piperazine,2-methoxyethyl piperazine,n-methoxyethylylpiperazine PubChem CID: 2734638 IUPAC-namn: 1-(2-methoxyethyl)piperazine LEDER: COCCN1CCNCC1
| Molekylformel | C7H16N2O |
|---|---|
| PubChem CID | 2734638 |
| MDL-nummer | MFCD00191214 |
| IUPAC-namn | 1-(2-methoxyethyl)piperazine |
| CAS | 13484-40-7 |
| InChI-nyckel | BMEMBBFDTYHTLH-UHFFFAOYSA-N |
| LEDER | COCCN1CCNCC1 |
| Molekylvikt (g/mol) | 144.21 |
| Synonym | 1-2-methoxyethyl piperazine,1-2-methoxyethyl-piperazine,1-2-methoxy-ethyl-piperazine,piperazine, 1-2-methoxyethyl,1-methoxy-2-piperazinylethane,pubchem14209,2-methoxyethylpiperazine,n-methoxyethyl piperazine,2-methoxyethyl piperazine,n-methoxyethylylpiperazine |
5-(3-Pyridyl)-1H-tetrazole, 98%
CAS: 3250-74-6 Molekylformel: C6H5N5 Molekylvikt (g/mol): 147.141 MDL-nummer: MFCD00040281 InChI-nyckel: SECHDFHDDVELCV-UHFFFAOYSA-N Synonym: 3-2h-tetrazol-5-yl pyridine,5-3-pyridyl-1h-tetrazole,3-1h-tetrazol-5-yl pyridine,5-3-pyridyl tetrazole,3-2h-tetrazol-5-yl-pyridine,pyridine, 3-2h-tetrazol-5-yl,unii-zc84pps834,3-2h-1,2,3,4-tetrazol-5-yl pyridine,3-1h-1,2,3,4-tetrazol-5-yl pyridine,5-3-pyridyl-2h-1,2,3,4-tetraazole PubChem CID: 151091 IUPAC-namn: 3-(2H-tetrazol-5-yl)pyridine LEDER: C1=CC(=CN=C1)C2=NNN=N2
| Molekylformel | C6H5N5 |
|---|---|
| PubChem CID | 151091 |
| MDL-nummer | MFCD00040281 |
| IUPAC-namn | 3-(2H-tetrazol-5-yl)pyridine |
| CAS | 3250-74-6 |
| InChI-nyckel | SECHDFHDDVELCV-UHFFFAOYSA-N |
| LEDER | C1=CC(=CN=C1)C2=NNN=N2 |
| Molekylvikt (g/mol) | 147.141 |
| Synonym | 3-2h-tetrazol-5-yl pyridine,5-3-pyridyl-1h-tetrazole,3-1h-tetrazol-5-yl pyridine,5-3-pyridyl tetrazole,3-2h-tetrazol-5-yl-pyridine,pyridine, 3-2h-tetrazol-5-yl,unii-zc84pps834,3-2h-1,2,3,4-tetrazol-5-yl pyridine,3-1h-1,2,3,4-tetrazol-5-yl pyridine,5-3-pyridyl-2h-1,2,3,4-tetraazole |