Molecular formula
C18H15N5O3
94 compounds have this formula on CompoundList.
- Molar mass
- 349.35g/mol
- Monoisotopic mass
- 349.1175Da
- Atoms
- 41
- Elements
- 4
- Rings plus double bonds
- 14
The formula C18H15N5O3 describes a molecule made of 18 carbon atoms, 15 hydrogen atoms, 5 nitrogen atoms and 3 oxygen atoms. It is written in Hill notation: carbon first, then hydrogen, then the other elements in alphabetical order. The formula tells you which atoms are present, not how they are connected, which is why several different chemicals can share it.
Elemental composition
- C Carbon × 1861.89%12.011 × 18 = 216.198 g/mol
- H Hydrogen × 154.33%1.008 × 15 = 15.120 g/mol
- N Nitrogen × 520.05%14.007 × 5 = 70.035 g/mol
- O Oxygen × 313.74%15.999 × 3 = 47.997 g/mol
Look up another formula
Compounds with the formula C18H15N5O3
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 94 of 94 compounds
GSK-3beta Inhibitor XI
CAS 626604-39-5C18H15N5O3
![Methyl [6-amino-5-cyano-4-(1H-indol-3-yl)-1,4-dihydropyrano[2,3-c]pyrazol-3-yl]acetate chemical structure, C18H15N5O3, CAS 665001-29-6](/s/MEEDWCOTUDHGMN-UHFFFAOYSA-N.svg)
Methyl [6-amino-5-cyano-4-(1H-indol-3-yl)-1,4-dihydropyrano[2,3-c]pyrazol-3-yl]acetate
CAS 665001-29-6C18H15N5O3
(E)-4-Methyl-N'-(3-nitrobenzylidene)-3-phenyl-1H-pyrazole-5-carbohydrazide
CAS 306758-96-3C18H15N5O3
N-(3-(1H-Tetrazol-1-yl)phenyl)-3-methyl-1-oxoisochroman-3-carboxamide
CAS 878955-30-7C18H15N5O3
![4-Amino-2-nitro-N-[4-(pyridin-4-ylamino)phenyl]benzamide chemical structure, C18H15N5O3, CAS 53290-19-0](/s/HTLGTFHGXSSHCJ-UHFFFAOYSA-N.svg)
4-Amino-2-nitro-N-[4-(pyridin-4-ylamino)phenyl]benzamide
CAS 53290-19-0C18H15N5O3
N'-(4-Methylbenzylidene)-3-(3-nitrophenyl)-1H-pyrazole-5-carbohydrazide
CAS 302918-44-1C18H15N5O3
3-(3-Nitrophenyl)-N'-(1-phenylethylidene)-1H-pyrazole-5-carbohydrazide
CAS 302918-52-1C18H15N5O3
PD 130883
CAS 123685-36-9C18H15N5O3
![N-(Furan-2-ylmethyl)-2-(4-oxo-1-phenylpyrazolo[3,4-d]pyrimidin-5-yl)acetamide chemical structure, C18H15N5O3, CAS 852440-28-9](/s/KSAKMAVMDRNNOG-UHFFFAOYSA-N.svg)
N-(Furan-2-ylmethyl)-2-(4-oxo-1-phenylpyrazolo[3,4-d]pyrimidin-5-yl)acetamide
CAS 852440-28-9C18H15N5O3
![7-[(Furan-2-yl)methyl]-6-imino-11-methyl-2-oxo-1,7,9-triazatricyclo[8.4.0.0^{3,8}]tetradeca-3(8),4,9,11,13-pentaene-5-carboxamide chemical structure, C18H15N5O3, CAS 683806-58-8](/s/VDPRHWZANFHFMP-UHFFFAOYSA-N.svg)
7-[(Furan-2-yl)methyl]-6-imino-11-methyl-2-oxo-1,7,9-triazatricyclo[8.4.0.0^{3,8}]tetradeca-3(8),4,9,11,13-pentaene-5-carboxamide
CAS 683806-58-8C18H15N5O3
![N-{[6-(4-Methoxyphenyl)-[1,2,4]triazolo[4,3-B]pyridazin-3-yl]methyl}furan-3-carboxamide chemical structure, C18H15N5O3, CAS 1775511-05-1](/s/ITSKEURYWGRWIA-UHFFFAOYSA-N.svg)
N-{[6-(4-Methoxyphenyl)-[1,2,4]triazolo[4,3-B]pyridazin-3-yl]methyl}furan-3-carboxamide
CAS 1775511-05-1C18H15N5O3
N'-(6-Nitro-2,3,4,9-tetrahydro-1H-carbazol-1-ylidene)isonicotinohydrazide
CAS 300838-76-0C18H15N5O3
N-(2-(3-(Furan-2-yl)-6-oxopyridazin-1(6H)-yl)ethyl)-1H-indazole-3-carboxamide
CAS 1226443-94-2C18H15N5O3
![N-(1H-Benzo[d]imidazol-2-yl)-2-(3-(furan-2-yl)-6-oxopyridazin-1(6H)-yl)propanamide chemical structure, C18H15N5O3, CAS 1286717-24-5](/s/JQIJVFZBCKXPJQ-UHFFFAOYSA-N.svg)
N-(1H-Benzo[d]imidazol-2-yl)-2-(3-(furan-2-yl)-6-oxopyridazin-1(6H)-yl)propanamide
CAS 1286717-24-5C18H15N5O3
N-(5-(5-Oxo-1-phenylpyrrolidin-3-yl)-1,3,4-oxadiazol-2-yl)picolinamide
CAS 1334375-64-2C18H15N5O3
![1-(2-Methoxyethyl)-2-(4-nitrophenyl)-1H-imidazo[4,5-b]quinoxaline chemical structure, C18H15N5O3, CAS 714254-66-7](/s/BYNGTSBSJYWUTN-UHFFFAOYSA-N.svg)
1-(2-Methoxyethyl)-2-(4-nitrophenyl)-1H-imidazo[4,5-b]quinoxaline
CAS 714254-66-7C18H15N5O3
![N-(Furan-2-ylmethyl)-2-(4-oxo-2-phenylpyrazolo[1,5-d][1,2,4]triazin-5(4H)-yl)acetamide chemical structure, C18H15N5O3, CAS 1021078-82-9](/s/JJBWYGOFKYINHS-UHFFFAOYSA-N.svg)
N-(Furan-2-ylmethyl)-2-(4-oxo-2-phenylpyrazolo[1,5-d][1,2,4]triazin-5(4H)-yl)acetamide
CAS 1021078-82-9C18H15N5O3
![N-[2-({3-Phenyl-[1,2,4]triazolo[4,3-b]pyridazin-6-yl}oxy)ethyl]furan-2-carboxamide chemical structure, C18H15N5O3, CAS 946272-50-0](/s/VJNMUGKVUZRXDC-UHFFFAOYSA-N.svg)
N-[2-({3-Phenyl-[1,2,4]triazolo[4,3-b]pyridazin-6-yl}oxy)ethyl]furan-2-carboxamide
CAS 946272-50-0C18H15N5O3
![N-(7,8-Dimethoxy-2,3-dihydro-imidazo[1,2-c]quinazolin-5-yl)-nicotinamide chemical structure, C18H15N5O3, CAS 1135222-98-8](/s/UPKZCDMMPFGKML-UHFFFAOYSA-N.svg)
N-(7,8-Dimethoxy-2,3-dihydro-imidazo[1,2-c]quinazolin-5-yl)-nicotinamide
CAS 1135222-98-8C18H15N5O3
![3-(8-Amino-2-furan-2-yl-[1,2,4]triazolo[1,5-a]pyrazin-6-yl)-benzoic acid ethyl ester chemical structure, C18H15N5O3, CAS 785050-31-9](/s/GUJWEDBSSHIBGM-UHFFFAOYSA-N.svg)
3-(8-Amino-2-furan-2-yl-[1,2,4]triazolo[1,5-a]pyrazin-6-yl)-benzoic acid ethyl ester
CAS 785050-31-9C18H15N5O3
![Ethyl 4-(8-amino-2-(furan-2-yl)-[1,2,4]triazolo[1,5-a]pyrazin-6-yl)benzoate chemical structure, C18H15N5O3, CAS 785051-00-5](/s/FFNRVNUZGAMRMN-UHFFFAOYSA-N.svg)
Ethyl 4-(8-amino-2-(furan-2-yl)-[1,2,4]triazolo[1,5-a]pyrazin-6-yl)benzoate
CAS 785051-00-5C18H15N5O3
![N-(2-Furylmethyl)(2-imino-1-methyl-5-oxo(1,6-dihydropyridino[1,2-a]pyridino[2, 3-d]pyrimidin-3-yl))carboxamide chemical structure, C18H15N5O3, CAS 371922-38-2](/s/JXHRNWSXNQAETM-UHFFFAOYSA-N.svg)
N-(2-Furylmethyl)(2-imino-1-methyl-5-oxo(1,6-dihydropyridino[1,2-a]pyridino[2, 3-d]pyrimidin-3-yl))carboxamide
CAS 371922-38-2C18H15N5O3
![7-Oxo-N-(4-phenoxyphenyl)-4,5,6,7-tetrahydro[1,2,4]triazolo[1,5-a]pyrimidine-5-carboxamide chemical structure, C18H15N5O3, CAS 1093070-97-3](/s/RBFZVDSHFYVDCF-UHFFFAOYSA-N.svg)
7-Oxo-N-(4-phenoxyphenyl)-4,5,6,7-tetrahydro[1,2,4]triazolo[1,5-a]pyrimidine-5-carboxamide
CAS 1093070-97-3C18H15N5O3
![5-Oxo-N-(4-phenoxyphenyl)-4,5,6,7-tetrahydro[1,2,4]triazolo[1,5-a]pyrimidine-7-carboxamide chemical structure, C18H15N5O3, CAS 1147188-18-8](/s/KYLBOIWQRKALBK-UHFFFAOYSA-N.svg)
5-Oxo-N-(4-phenoxyphenyl)-4,5,6,7-tetrahydro[1,2,4]triazolo[1,5-a]pyrimidine-7-carboxamide
CAS 1147188-18-8C18H15N5O3
- (E)-4-Methyl-N'-(4-nitrobenzylidene)-3-phenyl-1H-pyrazole-5-carbohydrazide306758-98-5C18H15N5O3
- 2-Hydroxy-N-((3-(1-methyl-1H-pyrrol-2-yl)-1,2,4-oxadiazol-5-yl)methyl)quinoline-4-carboxamide2034271-88-8C18H15N5O3
- 2-[5-(2-Methylphenyl)-2H-tetrazol-2-yl]-N-(3-oxo-1,3-dihydro-2-benzofuran-5-yl)acetamide953851-15-5C18H15N5O3
- 5-Amino-1-(4-methylphenyl)-N-(3-oxo-1,3-dihydro-2-benzofuran-5-yl)-1H-1,2,3-triazole-4-carboxamide1032227-45-4C18H15N5O3
- 8-(3-Methyl-1,2,4-oxadiazol-5-yl)-2-[2-(4-methylphenyl)-2-oxoethyl][1,2,4]triazolo[4,3-a]pyridin-3(2H)-one1396760-80-7C18H15N5O3
- Methyl N-[6-(5-methyl-3-pyridin-2-yl-1H-pyrazol-4-yl)-1,2-benzoxazol-3-yl]carbamate2113642-80-9C18H15N5O3
- 1-[(3,5-Dimethylisoxazol-4-yl)methyl]-3-(3-pyridin-4-yl-1,2,4-oxadiazol-5-yl)pyridin-2(1H)-one1396855-12-1C18H15N5O3
- 4-(1,3-Dioxo-1,3,3a,4,7,7a-hexahydro-2H-4,7-methanoisoindol-2-yl)-N-(4H-1,2,4-triazol-4-yl)benzamide1005112-09-3C18H15N5O3
- 2-(3-(1H-Indol-1-yl)-6-oxopyridazin-1(6H)-yl)-N-(3-methylisoxazol-5-yl)acetamide1797859-97-2C18H15N5O3
- 2-(6-Oxo-2-phenylpyrido[3,4-e][1,2,4]triazolo[1,5-a]pyrimidin-7(6H)-yl)butanoic acid945332-68-3C18H15N5O3
- Ethyl 9-methyl-8-oxo-5-phenyl-8,9-dihydropyrido[3,2-e][1,2,4]triazolo[1,5-a]pyrimidine-7-carboxylate1021047-17-5C18H15N5O3
- 2-(3-(1H-Indol-1-yl)-6-oxopyridazin-1(6H)-yl)-N-(5-methylisoxazol-3-yl)acetamide1797966-13-2C18H15N5O3
- N-(2-{[3-(Furan-2-yl)-1,2,4-oxadiazol-5-yl]methyl}phenyl)-2-(1H-pyrazol-1-yl)acetamide1797267-92-5C18H15N5O3
- 5-(Furan-2-yl)-N-(2-(2-(pyridin-2-yl)-1H-imidazol-1-yl)ethyl)isoxazole-3-carboxamide2034233-70-8C18H15N5O3
- 4-Hydroxy-6-methoxy-N-([1,2,4]triazolo[4,3-a]pyridin-3-ylmethyl)quinoline-3-carboxamide1630900-03-6C18H15N5O3
- N-(1-(3,4-Dimethylphenyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)furan-2-carboxamide900009-21-4C18H15N5O3
- 1-Methyl-N-(2-(nicotinamido)phenyl)-6-oxo-1,6-dihydropyridazine-3-carboxamide1206995-28-9C18H15N5O3
- N-((1H-Benzo[d]imidazol-2-yl)methyl)-2-(2,4-dioxo-1,2-dihydroquinazolin-3(4H)-yl)acetamide1207059-21-9C18H15N5O3
- N-(2-Methoxyphenyl)-2-{4-oxo-4H,5H-[1,2,4]triazolo[4,3-a]quinoxalin-5-yl}acetamide1357974-06-1C18H15N5O3
- N-(4-Methoxyphenyl)-2-(4-oxo[1,2,4]triazolo[4,3-a]quinoxalin-5(4H)-yl)acetamide1359399-53-3C18H15N5O3
- N-(2-(6-Oxo-3-(1H-pyrazol-1-yl)pyridazin-1(6H)-yl)ethyl)benzofuran-2-carboxamide1351604-70-0C18H15N5O3
- 4-Hydroxy-8-methoxy-N-([1,2,4]triazolo[4,3-a]pyridin-3-ylmethyl)quinoline-3-carboxamide1401558-96-0C18H15N5O3
- 5-(Furan-2-yl)-N-((1-methyl-5-(pyridin-4-yl)-1H-pyrazol-3-yl)methyl)isoxazole-3-carboxamide1421505-99-8C18H15N5O3
- 3-((1-(2-(Benzo[d]isoxazol-3-yl)acetyl)pyrrolidin-3-yl)oxy)pyrazine-2-carbonitrile2034322-36-4C18H15N5O3
- 9-(3,4-Dimethylphenyl)-2-(furan-2-yl)-8-oxo-8,9-dihydro-7H-purine-6-carboxamide898447-00-2C18H15N5O3
- (Z)-3-(Benzo[d][1,3]dioxol-5-yl)-N-((1-phenyl-1H-tetrazol-5-yl)methyl)acrylamide897615-09-7C18H15N5O3
- N-((1-(4-Methoxyphenyl)-1H-tetrazol-5-yl)methyl)benzofuran-2-carboxamide921503-35-7C18H15N5O3
- 5-(3,4-Dimethoxyphenyl)-3-(1-phenyl-1H-1,2,3-triazol-4-yl)-1,2,4-oxadiazole1251573-15-5C18H15N5O3
- N-(2-(3-(1H-Imidazol-1-yl)-6-oxopyridazin-1(6H)-yl)ethyl)benzofuran-2-carboxamide1396863-53-8C18H15N5O3
- 3-(3-Methyl-1,2,4-oxadiazol-5-yl)-1-((5-(o-tolyl)-1,2,4-oxadiazol-3-yl)methyl)pyridin-2(1H)-one1396759-47-9C18H15N5O3
- 5-(Furan-2-yl)-N-(2-(3-(pyridin-4-yl)-1H-pyrazol-1-yl)ethyl)isoxazole-3-carboxamide1448126-22-4C18H15N5O3
- 5-(Furan-2-yl)-N-(2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)ethyl)isoxazole-3-carboxamide1448125-78-7C18H15N5O3
- N-(3-([1,2,4]Triazolo[1,5-a]pyrimidin-6-yl)propyl)-4-oxo-4H-chromene-2-carboxamide2034614-87-2C18H15N5O3
- N-(3-([1,2,4]Triazolo[1,5-a]pyrimidin-6-yl)propyl)-2-oxo-2H-chromene-3-carboxamide2034376-47-9C18H15N5O3
- N-(2-(2,4-Dioxo-1,2-dihydropyrido[2,3-d]pyrimidin-3(4H)-yl)ethyl)indolizine-2-carboxamide2034271-66-2C18H15N5O3
- N-(2-(2,4-Dioxo-1,2-dihydropyrido[2,3-d]pyrimidin-3(4H)-yl)ethyl)-1H-indole-4-carboxamide2034373-43-6C18H15N5O3
- 2-(Benzo[d]isoxazol-3-yl)-N-(2-(4-oxobenzo[d][1,2,3]triazin-3(4H)-yl)ethyl)acetamide2034415-94-4C18H15N5O3
- 2-(1H-Indol-1-yl)-N-((3-(2-oxo-1,2-dihydropyridin-4-yl)-1,2,4-oxadiazol-5-yl)methyl)acetamide2034418-03-4C18H15N5O3
- N-((3-(5-Methylisoxazol-3-yl)-1,2,4-oxadiazol-5-yl)methyl)-4-(1H-pyrrol-1-yl)benzamide2034419-73-1C18H15N5O3
- 3-Cyano-N-((3-(6-ethoxypyridin-3-yl)-1,2,4-oxadiazol-5-yl)methyl)benzamide2034453-14-8C18H15N5O3
- 2-(1H-Indol-3-yl)-N-((3-(1-methyl-1H-pyrrol-2-yl)-1,2,4-oxadiazol-5-yl)methyl)-2-oxoacetamide1904198-50-0C18H15N5O3
- N-((3-(5-Cyclopropylisoxazol-3-yl)-1,2,4-oxadiazol-5-yl)methyl)-1H-indole-2-carboxamide1902979-90-1C18H15N5O3
- N-((3-(5-Cyclopropylisoxazol-3-yl)-1,2,4-oxadiazol-5-yl)methyl)-1H-indole-4-carboxamide1903044-72-3C18H15N5O3
- N1-(2-cyanophenyl)-N2-(2-(furan-2-yl)-2-(1H-pyrazol-1-yl)ethyl)oxalamide2034567-68-3C18H15N5O3
- (3-(5-(Furan-2-yl)-1,2,4-oxadiazol-3-yl)pyrrolidin-1-yl)(1H-indazol-3-yl)methanone2034350-89-3C18H15N5O3
- N-(2-(2,4-Dioxo-1,2-dihydropyrido[2,3-d]pyrimidin-3(4H)-yl)ethyl)-1H-indole-2-carboxamide2034320-68-6C18H15N5O3
- N-(2-{7-Oxo-6H,7H-furo[2,3-c]pyridin-6-yl}ethyl)-2-phenyl-2H-1,2,3-triazole-4-carboxamide2034373-86-7C18H15N5O3
- 7-Methoxy-N-((1-(pyridin-3-yl)-1H-1,2,3-triazol-4-yl)methyl)benzofuran-2-carboxamide2034563-30-7C18H15N5O3
- (E)-3-(Benzo[d][1,3]dioxol-5-yl)-N-((1-(pyridin-4-yl)-1H-1,2,3-triazol-4-yl)methyl)acrylamide2097941-02-9C18H15N5O3
- 1-(Pyridin-2-yl)-4-[5-(pyridin-3-yl)-1,2-oxazole-3-carbonyl]piperazin-2-one2310208-86-5C18H15N5O3
- 2-(1H-Indol-1-yl)-N-((3-(2-oxo-1,2-dihydropyridin-3-yl)-1,2,4-oxadiazol-5-yl)methyl)acetamide1904373-13-2C18H15N5O3
- Ethyl 4-(2-methyl-6-oxopyrido[3,4-e][1,2,4]triazolo[1,5-a]pyrimidin-7(6H)-yl)benzoate1158293-35-6C18H15N5O3
- Ethyl 4-(8-methyl-6-oxopyrido[3,4-e][1,2,4]triazolo[1,5-a]pyrimidin-7(6H)-yl)benzoate1158565-46-8C18H15N5O3
- 4-(6-Oxo-3-phenylpyrazolo[5,1-c]pyrido[4,3-e][1,2,4]triazin-7(6H)-yl)butanoic acid1209238-97-0C18H15N5O3
- 2-(2-Methyl-6-oxo-3-phenylpyrazolo[5,1-c]pyrido[4,3-e][1,2,4]triazin-7(6H)-yl)propanoic acid1214049-91-8C18H15N5O3
- 5-(2,4-Dimethoxyphenyl)-3-(1-phenyl-1H-1,2,3-triazol-4-yl)-1,2,4-oxadiazole1251589-86-2C18H15N5O3
- 2-Cyano-3-(furan-2-yl)-N-{[5-(4-methoxyphenyl)-1H-1,2,4-triazol-3-yl]methyl}prop-2-enamide1334025-77-2C18H15N5O3
- Methyl 4-[4-(1H-indazol-3-yl)-1H-1,2,3-triazol-1-yl]-2-methoxybenzoate1383705-83-6C18H15N5O3
- tert-Butyl 4-(4-bromo-7-carbamoyl-1H-indol-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate1643570-84-6C18H15N5O3
- 3-(2H-1,3-Benzodioxol-5-yl)-1-{[3-(pyridin-3-yl)pyrazin-2-yl]methyl}urea2097915-02-9C18H15N5O3
- 1-(Pyridin-3-yl)-4-[5-(pyridin-3-yl)-1,2-oxazole-3-carbonyl]piperazin-2-one2097867-77-9C18H15N5O3
- 4-{[1-(Quinoxaline-6-carbonyl)azetidin-3-yl]oxy}pyridine-2-carboxamide2549030-39-7C18H15N5O3
- 2-Methoxy-N-(6-oxo-3-phenylpyrazolo[1,5-a]pyrido[3,4-e]pyrimidin-7(6H)-yl)acetamide1211113-32-4C18H15N5O3
- 5-(Furan-2-yl)-N-((1-methyl-5-(pyridin-2-yl)-1H-pyrazol-3-yl)methyl)isoxazole-3-carboxamide1421507-89-2C18H15N5O3
- N-[4-[(3-Methyl-1,2,4-oxadiazol-5-yl)methoxy]phenyl]-1H-indazole-3-carboxamide1376040-32-2C18H15N5O3
- 2-(((4-Acetamidobenzylidene)hydrazono)methyl)quinoxaline 1,4-dioxide882864-75-7C18H15N5O3
- 5-(Furan-2-yl)-N-{[1-methyl-3-(pyridin-4-yl)-1H-pyrazol-5-yl]methyl}-1,2-oxazole-3-carboxamide2319720-64-2C18H15N5O3
- 5-(Furan-2-yl)-N-{[1-methyl-3-(pyridin-2-yl)-1H-pyrazol-5-yl]methyl}-1,2-oxazole-3-carboxamide2319720-99-3C18H15N5O3
- N'-(2-Cyanophenyl)-N-[[5-(2-methylpyrazol-3-yl)furan-2-yl]methyl]oxamide2415621-25-7C18H15N5O3
- RE54364Rgy1445586-42-4C18H15N5O3
Frequently asked questions
What is the molar mass of C18H15N5O3?
The molar mass of C18H15N5O3 is 349.35 g/mol, calculated from standard atomic weights for 18 carbon atoms, 15 hydrogen atoms, 5 nitrogen atoms and 3 oxygen atoms. The monoisotopic mass is 349.1175 Da.
How many compounds have the formula C18H15N5O3?
CompoundList lists 94 compounds with the molecular formula C18H15N5O3, including GSK-3beta Inhibitor XI, Methyl [6-amino-5-cyano-4-(1H-indol-3-yl)-1,4-dihydropyrano[2,3-c]pyrazol-3-yl]acetate, (E)-4-Methyl-N'-(3-nitrobenzylidene)-3-phenyl-1H-pyrazole-5-carbohydrazide. Compounds that share a formula are isomers. They contain the same atoms arranged differently, so their properties, uses and prices can be very different.
What is the degree of unsaturation of C18H15N5O3?
C18H15N5O3 has a degree of unsaturation of 14. That is the total number of rings and pi bonds (a double bond counts as one, a triple bond as two) in any structure with this formula.