Molecular formula
C18H22N4O3S
185 compounds have this formula on CompoundList.
- Molar mass
- 374.46g/mol
- Monoisotopic mass
- 374.1413Da
- Atoms
- 48
- Elements
- 5
- Rings plus double bonds
- 10
The formula C18H22N4O3S describes a molecule made of 18 carbon atoms, 22 hydrogen atoms, 4 nitrogen atoms, 3 oxygen atoms and 1 sulfur atom. 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 × 1857.74%12.011 × 18 = 216.198 g/mol
- H Hydrogen × 225.92%1.008 × 22 = 22.176 g/mol
- N Nitrogen × 414.96%14.007 × 4 = 56.028 g/mol
- O Oxygen × 312.82%15.999 × 3 = 47.997 g/mol
- S Sulfur × 18.56%32.06 × 1 = 32.060 g/mol
Look up another formula
Compounds with the formula C18H22N4O3S
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 185 compounds
8-((2-Methoxyethyl)thio)-3-methyl-7-(3-phenylpropyl)-1H-purine-2,6(3H,7H)-dione
CAS 489464-12-2C18H22N4O3S
![2-[(5,5-Dimethyl-6-oxa-17-thia-2,12,14-triazatetracyclo[8.7.0.03,8.011,16]heptadeca-1,3(8),9,11,13,15-hexaen-15-yl)-(2-hydroxyethyl)amino]ethanol chemical structure, C18H22N4O3S, CAS 487023-88-1](/s/PFIZFTCBEZUINU-UHFFFAOYSA-N.svg)
2-[(5,5-Dimethyl-6-oxa-17-thia-2,12,14-triazatetracyclo[8.7.0.03,8.011,16]heptadeca-1,3(8),9,11,13,15-hexaen-15-yl)-(2-hydroxyethyl)amino]ethanol
CAS 487023-88-1C18H22N4O3S
7-(2-Ethoxyethyl)-3-methyl-8-((3-methylbenzyl)thio)-1H-purine-2,6(3H,7H)-dione
CAS 442864-55-3C18H22N4O3S
8-((3-Hydroxypropyl)thio)-3-methyl-7-(3-phenylpropyl)-1H-purine-2,6(3H,7H)-dione
CAS 488843-25-0C18H22N4O3S
7-(2-Ethoxyethyl)-3-methyl-8-((4-methylbenzyl)thio)-1H-purine-2,6(3H,7H)-dione
CAS 442864-56-4C18H22N4O3S
7-(2-Ethoxyethyl)-3-methyl-8-(phenethylthio)-1H-purine-2,6(3H,7H)-dione
CAS 796880-83-6C18H22N4O3S
![N-[4-[(4-Methylpyrimidin-2-yl)sulfamoyl]phenyl]cyclohexanecarboxamide chemical structure, C18H22N4O3S, CAS 307544-40-7](/s/RVDHPVQUTOZADM-UHFFFAOYSA-N.svg)
N-[4-[(4-Methylpyrimidin-2-yl)sulfamoyl]phenyl]cyclohexanecarboxamide
CAS 307544-40-7C18H22N4O3S
![3-Cyclohexyl-6-(3,4,5-trimethoxyphenyl)[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole chemical structure, C18H22N4O3S, CAS 847185-46-0](/s/PPCZTEJETAEAMX-UHFFFAOYSA-N.svg)
3-Cyclohexyl-6-(3,4,5-trimethoxyphenyl)[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole
CAS 847185-46-0C18H22N4O3S
8-((3-HO-Propyl)thio)-1,3-DI-ME-7-(4-ME-benzyl)-3,7-dihydro-1H-purine-2,6-dione
CAS 476480-01-0C18H22N4O3S
![N-(4-Acetyl-5'-ethyl-2'-oxo-1'-propan-2-ylspiro[1,3,4-thiadiazole-5,3'-indole]-2-yl)acetamide chemical structure, C18H22N4O3S, CAS 585560-52-7](/s/FNUHPSWAQKJWBO-UHFFFAOYSA-N.svg)
N-(4-Acetyl-5'-ethyl-2'-oxo-1'-propan-2-ylspiro[1,3,4-thiadiazole-5,3'-indole]-2-yl)acetamide
CAS 585560-52-7C18H22N4O3S
![N-(4-{[4-(4-Pyridylmethyl)piperazino]sulfonyl}phenyl)acetamide chemical structure, C18H22N4O3S, CAS 443749-17-5](/s/VABKGTKCKZQGGK-UHFFFAOYSA-N.svg)
N-(4-{[4-(4-Pyridylmethyl)piperazino]sulfonyl}phenyl)acetamide
CAS 443749-17-5C18H22N4O3S
8-((2-Hydroxypropyl)sulfanyl)-1,3-dimethyl-7-(4-methylbenzyl)-3,7-dihydro-1H-purine-2,6-dione
CAS 397282-86-9C18H22N4O3S
![2-{[(4-Methylphenyl)sulfonyl]amino}-1-(4-(2-pyridyl)piperazinyl)ethan-1-one chemical structure, C18H22N4O3S, CAS 694475-83-7](/s/NNVOHZSKBIDBFM-UHFFFAOYSA-N.svg)
2-{[(4-Methylphenyl)sulfonyl]amino}-1-(4-(2-pyridyl)piperazinyl)ethan-1-one
CAS 694475-83-7C18H22N4O3S
![N-[3-(Azepan-1-ylsulfonyl)-4-methylphenyl]pyrazine-2-carboxamide chemical structure, C18H22N4O3S, CAS 742114-27-8](/s/HLNTTWHLMKLCJK-UHFFFAOYSA-N.svg)
N-[3-(Azepan-1-ylsulfonyl)-4-methylphenyl]pyrazine-2-carboxamide
CAS 742114-27-8C18H22N4O3S
N-Cyclopentyl-2-(2-(3-(2-methoxyphenyl)ureido)thiazol-4-yl)acetamide
CAS 897621-84-0C18H22N4O3S
Orb1706440
CAS 2229042-77-5C18H22N4O3S
1-(4-Aminosulfonyl-anilinoformyl)-4-benzyl-piperazine
CAS 1032229-27-8C18H22N4O3S
N-((1-(Cyclopropylsulfonyl)piperidin-4-yl)methyl)quinoxaline-2-carboxamide
CAS 1235671-36-9C18H22N4O3S
N-(4,6-Dimethylpyrimidin-2-yl)-4-(piperidin-1-ylsulfonyl)benzamide
CAS 940999-73-5C18H22N4O3S
![5-(Ethylamino)-2-{4-[(4-methylpiperidin-1-yl)sulfonyl]phenyl}-1,3-oxazole-4-carbonitrile chemical structure, C18H22N4O3S, CAS 941247-52-5](/s/HBKBTYQZGRSYGB-UHFFFAOYSA-N.svg)
5-(Ethylamino)-2-{4-[(4-methylpiperidin-1-yl)sulfonyl]phenyl}-1,3-oxazole-4-carbonitrile
CAS 941247-52-5C18H22N4O3S
![Ethyl 4-{2-[2-(phenylamino)-1,3-thiazol-4-yl]acetyl}piperazine-1-carboxylate chemical structure, C18H22N4O3S, CAS 1040677-63-1](/s/BWGNFPWUJCEUHY-UHFFFAOYSA-N.svg)
Ethyl 4-{2-[2-(phenylamino)-1,3-thiazol-4-yl]acetyl}piperazine-1-carboxylate
CAS 1040677-63-1C18H22N4O3S
4-Amino-N-(2-ethoxybenzyl)-3-(pyrrolidine-1-carbonyl)isothiazole-5-carboxamide
CAS 1286727-82-9C18H22N4O3S
2-(4-Phenylpiperazin-1-yl)-N-(4-sulfamoylphenyl)acetamide
CAS 697787-30-7C18H22N4O3S
![N-{2-Methyl-2H,4H,5H,6H-cyclopenta[c]pyrazol-3-yl}-4-(pyrrolidine-1-sulfonyl)benzamide chemical structure, C18H22N4O3S, CAS 1040638-57-0](/s/FGKBTESCSJPHFT-UHFFFAOYSA-N.svg)
N-{2-Methyl-2H,4H,5H,6H-cyclopenta[c]pyrazol-3-yl}-4-(pyrrolidine-1-sulfonyl)benzamide
CAS 1040638-57-0C18H22N4O3S
- 5-((3,4-Dimethoxyphenyl)(piperidin-1-yl)methyl)thiazolo[3,2-b][1,2,4]triazol-6-ol868219-56-1C18H22N4O3S
- 1-{4-[6-Oxo-3-(thiophen-2-yl)-1,6-dihydropyridazin-1-yl]butanoyl}piperidine-4-carboxamide1021222-08-1C18H22N4O3S
- N-{6-[({[(3-Methoxyphenyl)methyl]carbamoyl}methyl)sulfanyl]pyridazin-3-yl}-2-methylpropanamide1021256-02-9C18H22N4O3S
- Ethyl 4-(2-(phenylamino)thiazole-4-carboxamido)piperidine-1-carboxylate1171474-83-1C18H22N4O3S
- N-[6-({[(4-Ethoxyphenyl)carbamoyl]methyl}sulfanyl)pyridazin-3-yl]-2-methylpropanamide1021255-53-7C18H22N4O3S
- 4-(N-Cyclopropyl-N-methylsulfamoyl)-N-(2-methyl-2,4,5,6-tetrahydrocyclopenta[c]pyrazol-3-yl)benzamide1105222-43-2C18H22N4O3S
- (E)-N-(6-Ethoxy-3-(2-ethoxyethyl)benzo[d]thiazol-2(3H)-ylidene)-1-methyl-1H-pyrazole-5-carboxamide1173453-80-9C18H22N4O3S
- N-(4-(2-((Cyclohexylmethyl)amino)-2-oxoethyl)thiazol-2-yl)-2-oxo-1,2-dihydropyridine-3-carboxamide946258-42-0C18H22N4O3S
- 4-Acetyl-N-((1-(pyrazin-2-yl)piperidin-4-yl)methyl)benzenesulfonamide1396783-95-1C18H22N4O3S
- 8-((3-Hydroxypropyl)thio)-1,3-dimethyl-7-(3-methylbenzyl)-1H-purine-2,6(3H,7H)-dione442864-52-0C18H22N4O3S
- 7-Methoxy-6-(2-methylpropane-2-sulfonyl)-N-(4-methyl-1H-pyrazol-3-yl)quinolin-4-amine2724942-14-5C18H22N4O3S
- 8-((2-Hydroxypropyl)thio)-1,3-dimethyl-7-(3-methylbenzyl)-1H-purine-2,6(3H,7H)-dione497231-03-5C18H22N4O3S
- 7-Benzyl-8-((2-ethoxyethyl)thio)-1,3-dimethyl-1H-purine-2,6(3H,7H)-dione442864-80-4C18H22N4O3S
- 2-{4-[(Diethylamino)sulfonyl]phenyl}-5-pyrrolidinyl-1,3-oxazole-4-carbonitrile941266-02-0C18H22N4O3S
- 1-{2-[(4-Benzyl-5-methyl-4H-1,2,4-triazol-3-yl)sulfanyl]acetyl}piperidine-4-carboxylic acid731801-12-0C18H22N4O3S
- N-[3'-Acetyl-1-(3-methylbutyl)-2-oxo-1,2-dihydro-3'H-spiro[indole-3,2'-[1,3,4]thiadiazole]-5'-yl]acetamide902248-61-7C18H22N4O3S
- N-(4-Acetyl-1'-butyl-5'-methyl-2'-oxospiro[1,3,4-thiadiazole-5,3'-indole]-2-yl)acetamide842970-59-6C18H22N4O3S
- N-{3'-Acetyl-1-butyl-7-methyl-2-oxo-1,2-dihydro-3'H-spiro[indole-3,2'-[1,3,4]thiadiazole]-5'-yl}acetamide905787-44-2C18H22N4O3S
- 4-[5-(Azepan-1-yl)-4-cyano-1,3-oxazol-2-yl]-N,N-dimethylbenzene-1-sulfonamide941265-53-8C18H22N4O3S
- N-(4-Acetyl-5'-ethyl-2'-oxo-1'-propylspiro[1,3,4-thiadiazole-5,3'-indole]-2-yl)acetamide843619-83-0C18H22N4O3S
- 2-(3-Oxo-5-sulfanylidene-1,2-dihydroimidazo[1,2-c]quinazolin-2-yl)-N-(3-propan-2-yloxypropyl)acetamide6210-15-7C18H22N4O3S
- N-(5-tert-Butyl-1,3,4-thiadiazol-2-yl)-1-(4-methoxyphenyl)-5-oxopyrrolidine-3-carboxamide878726-34-2C18H22N4O3S
- 4-[4-Cyano-5-(4-methylpiperidin-1-yl)-1,3-oxazol-2-yl]-N,N-dimethylbenzenesulfonamide941265-00-5C18H22N4O3S
- 5-(Dimethylamino)-2-{4-[(4-methylpiperidin-1-yl)sulfonyl]phenyl}-1,3-oxazole-4-carbonitrile941248-07-3C18H22N4O3S
- N-(4-tert-Butyl-1,3-thiazol-2-yl)-3-nitro-4-(pyrrolidin-1-yl)benzamide380192-50-7C18H22N4O3S
- N-[3-Acetyl-12-methyl-6-(2-methylpropyl)-7-oxospiro[1,3,4-thiadiazoline-2,3'-i ndoline]-5-yl]acetamide905775-07-7C18H22N4O3S
- N-(4,6-Dimethylpyrimidin-2-yl)-3-(piperidin-1-ylsulfonyl)benzamide940999-40-6C18H22N4O3S
- 5-(Butylamino)-2-(4-(pyrrolidin-1-ylsulfonyl)phenyl)oxazole-4-carbonitrile940998-09-4C18H22N4O3S
- 2-(4-(Azepan-1-ylsulfonyl)phenyl)-5-(ethylamino)oxazole-4-carbonitrile941245-63-2C18H22N4O3S
- 2-(4-(Azepan-1-ylsulfonyl)phenyl)-5-(dimethylamino)oxazole-4-carbonitrile940999-77-9C18H22N4O3S
- 3-({[2-(3,4-Dimethoxyphenyl)-5-methyl-1,3-oxazol-4-yl]methyl}sulfanyl)-4-ethyl-5-methyl-4H-1,2,4-triazole1116050-22-6C18H22N4O3S
- Carbamic acid, ((bis(2-cyanoethyl)amino)thio)methyl-, 2,3-dihydro-2,2-dimethyl-7-benzofuranyl ester82560-29-0C18H22N4O3S
- Ethyl 2-((5-(1H-indol-3-yl)-4-(2-methoxyethyl)-4H-1,2,4-triazol-3-yl)thio)propanoate852145-27-8C18H22N4O3S
- Methyl 2-((5-(1H-indol-3-yl)-4-(2-methoxyethyl)-4H-1,2,4-triazol-3-yl)thio)butanoate852145-29-0C18H22N4O3S
- 5-((4-Hydroxypiperidin-1-yl)(4-methoxyphenyl)methyl)-2-methylthiazolo[3,2-b][1,2,4]triazol-6-ol851810-21-4C18H22N4O3S
- 5-((4-Hydroxypiperidin-1-yl)(3-methoxyphenyl)methyl)-2-methylthiazolo[3,2-b][1,2,4]triazol-6-ol851969-54-5C18H22N4O3S
- 5-((2,6-Dimethylmorpholino)(4-methoxyphenyl)methyl)thiazolo[3,2-b][1,2,4]triazol-6-ol1008946-49-3C18H22N4O3S
- 3-Hydroxy-4,4-dimethyl-8-oxo-N-[4-(propan-2-yl)phenyl]-1-thioxo-1,4,7,8-tetrahydro-6H-pyrazolo[1,2-a][1,2,4]triazine-6-carboxamide956402-32-7C18H22N4O3S
- 1-{[(6-Methoxy-4-methylquinazolin-2-yl)sulfanyl]acetyl}piperidine-4-carboxamide896665-15-9C18H22N4O3S
- 3-Ethoxy-N-{5-[1-(2-methylphenyl)-5-oxopyrrolidin-3-yl]-1,3,4-thiadiazol-2-yl}propanamide924978-22-3C18H22N4O3S
- 5-(Isobutylamino)-2-(4-(pyrrolidin-1-ylsulfonyl)phenyl)oxazole-4-carbonitrile941245-04-1C18H22N4O3S
- 2-((7-(Furan-2-ylmethyl)-5,6-dimethyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)-4-(methylthio)butanoic acid1101786-09-7C18H22N4O3S
- 2-[3-Methyl-5-(morpholine-4-carbonyl)-1H-pyrazol-1-yl]-N-[3-(methylsulfanyl)phenyl]acetamide1171683-17-2C18H22N4O3S
- N-(3,4-Dimethoxyphenyl)-2-((4-(pyrrolidin-1-yl)pyrimidin-2-yl)thio)acetamide1251577-03-3C18H22N4O3S
- 5-Methyl-N-({1-[2-(methylsulfanyl)pyridine-3-carbonyl]piperidin-4-yl}methyl)-1,2-oxazole-3-carboxamide1235294-39-9C18H22N4O3S
- N-(5-Isobutyl-1,3,4-thiadiazol-2-yl)-4,7-dimethoxy-1-methyl-1H-indole-2-carboxamide1351689-32-1C18H22N4O3S
- 1-(6-Methylpyridazin-3-yl)-N-(4-(methylsulfonyl)phenyl)piperidine-4-carboxamide1421508-04-4C18H22N4O3S
- N-(Benzo[d][1,3]dioxol-5-yl)-4-(((1-methyl-1H-imidazol-2-yl)thio)methyl)piperidine-1-carboxamide1428357-96-3C18H22N4O3S
- 4-(6-(Phenethylsulfonyl)-6,7-dihydro-5H-pyrrolo[3,4-d]pyrimidin-2-yl)morpholine2034371-45-2C18H22N4O3S
- 4-[(4-Benzylpiperazin-1-yl)sulfonyl]benzohydrazide483348-24-9C18H22N4O3S
- Butyl 4-[(1-ethylpyrazole-4-carbonyl)carbamothioylamino]benzoate494218-84-7C18H22N4O3S
- N-[(E)-1-(3,4-Dimethoxyphenyl)ethylideneamino]-2-(4,6-dimethylpyrimidin-2-yl)sulfanylacetamide306303-86-6C18H22N4O3S
- N-[5-(2-Ethoxyethyl)-1,3,4-thiadiazol-2-yl]-1-(2-methylphenyl)-5-oxopyrrolidine-3-carboxamide887674-34-2C18H22N4O3S
- 2-[[3-(2-Methoxyethyl)-4-oxo-5H-pyrimido[5,4-b]indol-2-yl]sulfanyl]-N-propylacetamide888434-16-0C18H22N4O3S
- N-[(2E)-5-tert-Butyl-1,3,4-thiadiazol-2(3H)-ylidene]-1-(2-methoxyphenyl)-5-oxopyrrolidine-3-carboxamide1190251-93-4C18H22N4O3S
- N-[(2E)-5-tert-Butyl-1,3,4-thiadiazol-2(3H)-ylidene]-1-(3-methoxyphenyl)-5-oxopyrrolidine-3-carboxamide1009261-35-1C18H22N4O3S
- (3-Methoxy-1-methyl-1H-pyrazol-4-yl)(4-(2-(thiophen-2-yl)cyclopropanecarbonyl)piperazin-1-yl)methanone1207057-95-1C18H22N4O3S
- N-[3-(Acetylamino)phenyl]-2-[acetyl(isopropyl)amino]-4-methyl-1,3-thiazole-5-carboxamide1219579-55-1C18H22N4O3S
- N-[4-(Acetylamino)phenyl]-2-[acetyl(isopropyl)amino]-4-methyl-1,3-thiazole-5-carboxamide1219572-09-4C18H22N4O3S
- 1-Methyl-3-(4-methylphenyl)sulfonyl-1-(4-pyrrolidin-1-yl-2-pyridinyl)urea75291-67-7C18H22N4O3S
- N-[4-[(4,6-Dimethylpyrimidin-2-yl)sulfamoyl]phenyl]cyclopentanecarboxamide546099-79-0C18H22N4O3S
- N-[4-[4-(Pyridin-2-ylmethyl)piperazin-1-yl]sulfonylphenyl]acetamide519005-56-2C18H22N4O3S
- N-Cyclopropyl-2-({1-[2-(4-morpholinyl)-2-oxoethyl]-1H-benzimidazol-2-yl}sulfanyl)acetamide606110-67-2C18H22N4O3S
- Methyl 5-methyl-2-({[4-(pyridin-2-yl)piperazin-1-yl]acetyl}amino)thiophene-3-carboxylate885439-32-7C18H22N4O3S
- Cyclohexyl(4-(6-nitrobenzo[d]thiazol-2-yl)piperazin-1-yl)methanone341953-40-0C18H22N4O3S
- N'-[2-(2,4-Dimethylphenyl)-4,6-dihydrothieno[3,4-c]pyrazol-3-yl]-N-(2-methoxyethyl)oxamide899952-34-2C18H22N4O3S
- N-[5-(4-Methoxybenzyl)-1,4,5,6-tetrahydro-1,3,5-triazin-2-yl]-4-methylbenzenesulfonamide879579-32-5C18H22N4O3S
- N-(4-(2-(Cycloheptylamino)-2-oxoethyl)thiazol-2-yl)-6-oxo-1,6-dihydropyridine-3-carboxamide946258-68-0C18H22N4O3S
- N-Ethyl-2-(5-(hydroxymethyl)-2-((2-(indolin-1-yl)-2-oxoethyl)thio)-1H-imidazol-1-yl)acetamide923173-41-5C18H22N4O3S
- N-[2-(Dimethylamino)-2-(thiophen-2-yl)ethyl]-N'-(3-acetamidophenyl)ethanediamide941932-48-5C18H22N4O3S
- 2-{3-Cyclohexyl-2,4-dioxo-1H,2H,3H,4H,5H,6H,7H-cyclopenta[d]pyrimidin-1-yl}-N-(1,3-thiazol-2-yl)acetamide946204-03-1C18H22N4O3S
- N-[6-({[(2-Ethoxyphenyl)carbamoyl]methyl}sulfanyl)pyridazin-3-yl]-2-methylpropanamide1021214-24-3C18H22N4O3S
- 1-(4-Methoxyphenyl)-3-{4-[3-oxo-3-(pyrrolidin-1-yl)propyl]-1,3-thiazol-2-yl}urea1040665-39-1C18H22N4O3S
- N-{4-[3-(Azepan-1-yl)-3-oxopropyl]-1,3-thiazol-2-yl}-6-oxo-1,6-dihydropyridine-3-carboxamide1040643-16-0C18H22N4O3S
- N-Cyclopropyl-2-(5-(hydroxymethyl)-2-((2-oxo-2-(p-tolylamino)ethyl)thio)-1H-imidazol-1-yl)acetamide923140-12-9C18H22N4O3S
- 2-Methoxy-N-(2-(2-oxo-2-(phenethylamino)ethyl)-4,6-dihydro-2H-thieno[3,4-c]pyrazol-3-yl)acetamide1105250-79-0C18H22N4O3S
Frequently asked questions
What is the molar mass of C18H22N4O3S?
The molar mass of C18H22N4O3S is 374.46 g/mol, calculated from standard atomic weights for 18 carbon atoms, 22 hydrogen atoms, 4 nitrogen atoms, 3 oxygen atoms and 1 sulfur atom. The monoisotopic mass is 374.1413 Da.
How many compounds have the formula C18H22N4O3S?
CompoundList lists 185 compounds with the molecular formula C18H22N4O3S, including 8-((2-Methoxyethyl)thio)-3-methyl-7-(3-phenylpropyl)-1H-purine-2,6(3H,7H)-dione, 2-[(5,5-Dimethyl-6-oxa-17-thia-2,12,14-triazatetracyclo[8.7.0.03,8.011,16]heptadeca-1,3(8),9,11,13,15-hexaen-15-yl)-(2-hydroxyethyl)amino]ethanol, 7-(2-Ethoxyethyl)-3-methyl-8-((3-methylbenzyl)thio)-1H-purine-2,6(3H,7H)-dione. 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 C18H22N4O3S?
C18H22N4O3S has a degree of unsaturation of 10. 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.