Molecular formula
C16H19N5O3
142 compounds have this formula on CompoundList.
- Molar mass
- 329.36g/mol
- Monoisotopic mass
- 329.1488Da
- Atoms
- 43
- Elements
- 4
- Rings plus double bonds
- 10
The formula C16H19N5O3 describes a molecule made of 16 carbon atoms, 19 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 × 1658.35%12.011 × 16 = 192.176 g/mol
- H Hydrogen × 195.81%1.008 × 19 = 19.152 g/mol
- N Nitrogen × 521.26%14.007 × 5 = 70.035 g/mol
- O Oxygen × 314.57%15.999 × 3 = 47.997 g/mol
Look up another formula
Compounds with the formula C16H19N5O3
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 142 compounds
8-(Dimethylamino)-3-methyl-7-(2-phenoxyethyl)-3,7-dihydro-1H-purine-2,6-dione
CAS 476481-55-7C16H19N5O3
8-Benzylamino-7-(2-methoxy-ethyl)-3-methyl-3,7-dihydro-purine-2,6-dione
CAS 333769-08-7C16H19N5O3
![3-(3,5-Dimethyl-1H-pyrazol-4-yl)-N'-[(1E)-1-(4-nitrophenyl)ethylidene]propanehydrazide chemical structure, C16H19N5O3, CAS 307321-70-6](/s/MSAQFERSYLSCNE-LICLKQGHSA-N.svg)
3-(3,5-Dimethyl-1H-pyrazol-4-yl)-N'-[(1E)-1-(4-nitrophenyl)ethylidene]propanehydrazide
CAS 307321-70-6C16H19N5O3
![3-(3,5-Dimethyl-1H-pyrazol-4-yl)-N-[(Z)-1-(3-nitrophenyl)ethylideneamino]propanamide chemical structure, C16H19N5O3, CAS 307321-69-3](/s/CLYIZPINNFIHPM-YVLHZVERSA-N.svg)
3-(3,5-Dimethyl-1H-pyrazol-4-yl)-N-[(Z)-1-(3-nitrophenyl)ethylideneamino]propanamide
CAS 307321-69-3C16H19N5O3
![2-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-N-(furan-2-ylmethyl)acetamide chemical structure, C16H19N5O3, CAS 863448-10-6](/s/DVUILMVGYSNGIM-UHFFFAOYSA-N.svg)
2-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-N-(furan-2-ylmethyl)acetamide
CAS 863448-10-6C16H19N5O3
7-(2-HO-Ethyl)-3-ME-8-((4-methylbenzyl)amino)-3,7-dihydro-1H-purine-2,6-dione
CAS 476481-52-4C16H19N5O3
8-(Ethylamino)-3-methyl-7-(2-phenoxyethyl)-3,7-dihydro-1H-purine-2,6-dione
CAS 476481-57-9C16H19N5O3
8-(Benzyl(methyl)amino)-7-(2-HO-ethyl)-3-methyl-3,7-dihydro-1H-purine-2,6-dione
CAS 476481-54-6C16H19N5O3
7-(2-Hydroxyethyl)-3-ME-8-((2-phenylethyl)amino)-3,7-dihydro-1H-purine-2,6-dione
CAS 476481-35-3C16H19N5O3
7-Benzyl-8-(3-hydroxypropylamino)-3-methylpurine-2,6-dione
CAS 442865-22-7C16H19N5O3
Cypendazole
CAS 28559-00-4C16H19N5O3
![7-Benzyl-8-[(2-hydroxyethyl)amino]-1,3-dimethyl-2,3,6,7-tetrahydro-1H-purine-2,6-dione chemical structure, C16H19N5O3, CAS 130187-67-6](/s/PWHQCIXEJMEGKP-UHFFFAOYSA-N.svg)
7-Benzyl-8-[(2-hydroxyethyl)amino]-1,3-dimethyl-2,3,6,7-tetrahydro-1H-purine-2,6-dione
CAS 130187-67-6C16H19N5O3
6-Methyl-5-(2-oxo-2-(4-(pyridin-2-yl)piperazin-1-yl)ethyl)pyrimidine-2,4(1H,3H)-dione
CAS 1203006-91-0C16H19N5O3
N-(2-(4-Cyclopentyl-6-oxopyrimidin-1(6H)-yl)ethyl)-6-oxo-1,6-dihydropyridazine-3-carboxamide
CAS 1797586-70-9C16H19N5O3
![N-((1-Cyclohexyl-1H-tetrazol-5-yl)methyl)benzo[d][1,3]dioxole-5-carboxamide chemical structure, C16H19N5O3, CAS 921144-06-1](/s/SYAFPCOUWVTURE-UHFFFAOYSA-N.svg)
N-((1-Cyclohexyl-1H-tetrazol-5-yl)methyl)benzo[d][1,3]dioxole-5-carboxamide
CAS 921144-06-1C16H19N5O3
8-((2-Hydroxyethyl)amino)-3-methyl-7-(3-methylbenzyl)-1H-purine-2,6(3H,7H)-dione
CAS 332897-29-7C16H19N5O3
![5-(4-(Cyclopropanecarbonyl)piperazin-1-yl)-1-methylpyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione chemical structure, C16H19N5O3, CAS 1172754-43-6](/s/DKPGFFIJBLCCLW-UHFFFAOYSA-N.svg)
5-(4-(Cyclopropanecarbonyl)piperazin-1-yl)-1-methylpyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione
CAS 1172754-43-6C16H19N5O3
![9-(Furan-2-ylmethyl)-1,3,7-trimethyl-7,8-dihydro-6H-purino[7,8-a]pyrimidine-2,4-dione chemical structure, C16H19N5O3, CAS 877616-20-1](/s/WKRUEYAJTFICHS-UHFFFAOYSA-N.svg)
9-(Furan-2-ylmethyl)-1,3,7-trimethyl-7,8-dihydro-6H-purino[7,8-a]pyrimidine-2,4-dione
CAS 877616-20-1C16H19N5O3
7-Benzyl-8-(2-methoxyethylamino)-3-methylpurine-2,6-dione
CAS 674815-24-8C16H19N5O3
![3-tert-Butyl-N'-[(1E)-1-(3-nitrophenyl)ethylidene]-1H-pyrazole-5-carbohydrazide chemical structure, C16H19N5O3, CAS 5791-35-5](/s/WBACIZGBAUDFLU-LICLKQGHSA-N.svg)
3-tert-Butyl-N'-[(1E)-1-(3-nitrophenyl)ethylidene]-1H-pyrazole-5-carbohydrazide
CAS 5791-35-5C16H19N5O3
![6-[4-(2-Methoxyphenyl)piperazin-1-yl]-3-nitropyridin-2-amine chemical structure, C16H19N5O3, CAS 1987637-35-3](/s/IVUOUNUPNDGSLF-UHFFFAOYSA-N.svg)
6-[4-(2-Methoxyphenyl)piperazin-1-yl]-3-nitropyridin-2-amine
CAS 1987637-35-3C16H19N5O3
![1-[3-(4-Oxo-1,2,3-benzotriazin-3-yl)propanoyl]piperidine-4-carboxamide chemical structure, C16H19N5O3, CAS 451469-41-3](/s/SCIMAASMVWPKNE-UHFFFAOYSA-N.svg)
1-[3-(4-Oxo-1,2,3-benzotriazin-3-yl)propanoyl]piperidine-4-carboxamide
CAS 451469-41-3C16H19N5O3
![2-(2-{[1-(4-Methoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl]amino}ethoxy)ethanol chemical structure, C16H19N5O3, CAS 686301-55-3](/s/CTDRDYBHBQFQKF-UHFFFAOYSA-N.svg)
2-(2-{[1-(4-Methoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl]amino}ethoxy)ethanol
CAS 686301-55-3C16H19N5O3
![Ethyl N-[(Z)-1-[4-[(2-methylpyrazole-3-carbonyl)amino]phenyl]ethylideneamino]carbamate chemical structure, C16H19N5O3, CAS 522619-82-5](/s/HWFULRHVUZLQSI-ODLFYWEKSA-N.svg)
Ethyl N-[(Z)-1-[4-[(2-methylpyrazole-3-carbonyl)amino]phenyl]ethylideneamino]carbamate
CAS 522619-82-5C16H19N5O3
- 8-(Benzylamino)-7-(2-hydroxypropyl)-3-methyl-1H-purine-2,6(3H,7H)-dione876894-00-7C16H19N5O3
- 5-Nitro-N-(4-(2-(pyrrolidin-1-yl)ethoxy)phenyl)pyrimidin-2-amine910904-64-2C16H19N5O3
- 3-Ethyl-9-(furan-2-ylmethyl)-1-methyl-7,8-dihydro-6H-purino[7,8-a]pyrimidine-2,4-dione946360-94-7C16H19N5O3
- 6-Hydroxy-N-(2-((6-(pyrrolidin-1-yl)pyrimidin-4-yl)oxy)ethyl)nicotinamide1203258-55-2C16H19N5O3
- 6-(4-(5-Cyclopropyl-1,3,4-oxadiazol-2-yl)piperidine-1-carbonyl)-2-methylpyridazin-3(2H)-one1208682-85-2C16H19N5O3
- 1-[2-(Ethylcarbamoyl)-1,2,3,4-tetrahydroisoquinolin-5-yl]-5-methyl-1H-1,2,3-triazole-4-carboxylic acid1315367-22-6C16H19N5O3
- N-(3-(tert-Butyl)isoxazol-5-yl)-1-(pyrazine-2-carbonyl)azetidine-3-carboxamide1448036-41-6C16H19N5O3
- N-(2-(4-(Furan-2-yl)-1-methyl-1H-imidazol-2-yl)ethyl)-3-methoxy-1-methyl-1H-pyrazole-4-carboxamide1421513-41-8C16H19N5O3
- 2-Methyl-6-(4-((6-methylpyridazin-3-yl)oxy)piperidine-1-carbonyl)pyridazin-3(2H)-one1797129-16-8C16H19N5O3
- N-[2-(3,5-Dimethylisoxazol-4-yl)ethyl]-N,6-dimethyl-4-oxo-4,5-dihydropyrazolo[1,5-a]pyrazine-2-carboxamide1788829-80-0C16H19N5O3
- (6,7-Dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-3-yl)(3-((6-methylpyridazin-3-yl)oxy)pyrrolidin-1-yl)methanone2034482-45-4C16H19N5O3
- N-[2-(1H-Benzimidazol-1-yl)ethyl]-2-(4,4-dimethyl-2,5-dioxoimidazolidin-1-yl)acetamide1630899-91-0C16H19N5O3
- 2-[(2-Hydroxy-3,4-dihydroquinolin-7-yl)oxy]-N-[5-(propan-2-yl)-1H-1,2,4-triazol-3-yl]acetamide1676087-00-5C16H19N5O3
- 4,7,8-Trimethyl-2-(2-oxopropyl)-6-prop-2-enylpurino[7,8-a]imidazole-1,3-dione878411-85-9C16H19N5O3
- N-(2-Methoxyethyl)-4-oxo-8-(p-tolyl)-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazine-3-carboxamide946360-41-4C16H19N5O3
- 8-(4-Methoxyphenyl)-4-oxo-N-propyl-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazine-3-carboxamide946311-15-5C16H19N5O3
- 1-Methyl-3-[[4-(2-pyridinylmethyl)-1-piperazinyl]carbonyl]-1H-pyrazole-4-carboxylic acid1174882-05-3C16H19N5O3
- 8-Amino-1,3-dimethyl-7-(3-phenoxypropyl)-1H-purine-2,6(3H,7H)-dione1105197-17-8C16H19N5O3
- N-Cyclopentyl-N~2~-[(4-oxo-1,2,3-benzotriazin-3(4H)-yl)acetyl]glycinamide1190286-71-5C16H19N5O3
- N-(2-((6-Morpholinopyrimidin-4-yl)oxy)ethyl)picolinamide1209192-15-3C16H19N5O3
- N-(1,3-Benzodioxol-5-ylmethyl)-1-(1H-1,2,3,4-tetraazol-1-yl)-1-cyclohexanecarboxamide1374541-99-7C16H19N5O3
- N-[3-(4-Methoxybenzyl)-1H-1,2,4-triazol-5-yl]-1-methyl-5-oxopyrrolidine-3-carboxamide1574320-12-9C16H19N5O3
- Ethyl 1-[6-(1H-pyrazol-1-yl)pyridazine-3-carbonyl]piperidine-4-carboxylate1351588-40-3C16H19N5O3
- N-[1-(2-Methoxyacetyl)-1,2,3,4-tetrahydroquinolin-7-yl]-1-methyl-1H-1,2,3-triazole-4-carboxamide1797970-65-0C16H19N5O3
- 1-Methyl-N-(4-(2-morpholino-2-oxoethyl)phenyl)-1H-1,2,3-triazole-4-carboxamide1448135-91-8C16H19N5O3
- 1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)-3-((4-(dimethylamino)pyrimidin-2-yl)methyl)urea1797719-25-5C16H19N5O3
- N-(2-((4-(Dimethylamino)-2-methoxypyrimidin-5-yl)amino)-2-oxoethyl)benzamide1797224-75-9C16H19N5O3
- N1-(isoxazol-3-yl)-N2-((1-(pyridin-4-yl)piperidin-4-yl)methyl)oxalamide2034230-88-9C16H19N5O3
- 5-(3-((6-(Dimethylamino)pyrazin-2-yl)oxy)pyrrolidine-1-carbonyl)pyridin-2(1H)-one2034286-17-2C16H19N5O3
- N-(2-Ethoxyphenyl)-2-(2-ethyl-5-oxo-5,6-dihydro-4H-imidazo[1,2-b][1,2,4]triazol-6-yl)acetamide1158528-80-3C16H19N5O3
- 2-(2-Amino-pyrimidin-4-yl)-4-oxo-1,4,6,7-tetrahydro-pyrrolo[3,2-c]pyridine-5-carboxylic acid tert-butyl ester845267-95-0C16H19N5O3
- 2-(4-Methylpiperazin-1-yl)-2-oxo-N-[(4-oxo-3,4-dihydrophthalazin-1-yl)methyl]acetamide946219-82-5C16H19N5O3
- 7-(4-Methoxyphenethyl)-3-methyl-8-(methylamino)-1H-purine-2,6(3H,7H)-dione1105244-90-3C16H19N5O3
- 7-(2-Hydroxy-2-phenylethyl)-1,3-dimethyl-8-(methylamino)-1H-purine-2,6(3H,7H)-dione1105196-85-7C16H19N5O3
- 1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)-3-(2-((6-methylpyridazin-3-yl)amino)ethyl)urea1171089-52-3C16H19N5O3
- Methyl 4-({[1-(1H-tetrazol-1-yl)cyclohexyl]carbonyl}amino)benzoate1212303-30-4C16H19N5O3
- N-(1,3-Dihydro-2H-benzimidazol-2-ylidene)-5-oxo-5-(3-oxopiperazin-1-yl)pentanamide1219579-26-6C16H19N5O3
- 3-{2-Methyl-1,5-dioxo-1H,2H,4H,5H-[1,2,4]triazolo[4,3-a]quinazolin-4-yl}-N-(propan-2-yl)propanamide1113105-06-8C16H19N5O3
- N1-(isoxazol-3-yl)-N2-((1-(pyridin-2-yl)piperidin-4-yl)methyl)oxalamide1234996-31-6C16H19N5O3
- 4-{[2-(Furan-2-yl)-5-methyl-1,3-oxazol-4-yl]methyl}-2-[(1H-1,2,4-triazol-1-yl)methyl]morpholine1333994-65-2C16H19N5O3
- N-((3-Methyl-1,2,4-oxadiazol-5-yl)methyl)-1-picolinoylpiperidine-4-carboxamide1334376-07-6C16H19N5O3
- Carbamic acid, N-[2-(6-oxopyrazolo[1,5-a]pyrido[3,4-e]pyrimidin-7(6H)-yl)ethyl]-, 1,1-dimethylethyl ester1374509-42-8C16H19N5O3
- Ethyl 1-(2-phenyl-2H-tetrazole-5-carbonyl)piperidine-3-carboxylate1396580-37-2C16H19N5O3
- 1-(Benzo[d][1,3]dioxol-5-yl)-3-(2-(dimethylamino)-4,6-dimethylpyrimidin-5-yl)urea1448058-32-9C16H19N5O3
- 1-(2-Methoxy-4-morpholinopyrimidin-5-yl)-3-phenylurea1788532-42-2C16H19N5O3
- 2-(2-(3-((6-Methylpyridazin-3-yl)oxy)piperidin-1-yl)-2-oxoethyl)pyridazin-3(2H)-one2034251-13-1C16H19N5O3
- (3-((6-Methoxypyrazin-2-yl)oxy)piperidin-1-yl)(5-methylpyrazin-2-yl)methanone2034501-79-4C16H19N5O3
- Isoxazol-5-yl(4-(4,5,6,7-tetrahydropyrazolo[1,5-a]pyridine-2-carbonyl)piperazin-1-yl)methanone2034546-47-7C16H19N5O3
- N-(2-Oxo-2-{3-[4-(phenoxymethyl)-1H-1,2,3-triazol-1-yl]azetidin-1-yl}ethyl)acetamide2034592-27-1C16H19N5O3
- 6-Morpholino-N-(4,5,6,7-tetrahydrobenzo[c]isoxazol-3-yl)pyrimidine-4-carboxamide1904105-47-0C16H19N5O3
- N-(2-(3-Cyclopropyl-6-oxopyridazin-1(6H)-yl)ethyl)-6-ethoxypyridazine-3-carboxamide2034534-77-3C16H19N5O3
- 4,7-Dimethyl-2-(3-oxobutan-2-yl)-6-prop-2-enylpurino[7,8-a]imidazole-1,3-dione878718-40-2C16H19N5O3
- 8-(Dimethylamino)-7-(2-hydroxy-2-phenylethyl)-3-methyl-1H-purine-2,6(3H,7H)-dione941886-09-5C16H19N5O3
- N-(3-Methoxypropyl)-4-oxo-8-phenyl-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazine-3-carboxamide946335-04-2C16H19N5O3
- N-(1-Hydroxybutan-2-yl)-4-oxo-8-phenyl-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazine-3-carboxamide946381-87-9C16H19N5O3
- N-(1-Methoxypropan-2-yl)-4-oxo-8-phenyl-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazine-3-carboxamide952847-52-8C16H19N5O3
- N-(2-Hydroxypropyl)-4-oxo-8-(p-tolyl)-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazine-3-carboxamide946360-45-8C16H19N5O3
- N-Isopropyl-8-(4-methoxyphenyl)-4-oxo-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazine-3-carboxamide946230-01-9C16H19N5O3
- 2-(3,4-Dioxo-8-phenyl-3,4,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazin-2(6H)-yl)-N-propylacetamide941917-26-6C16H19N5O3
- 2-(3,4-Dioxo-8-phenyl-3,4,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazin-2(6H)-yl)-N-isopropylacetamide941976-03-0C16H19N5O3
- N-(3-Hydroxypropyl)-4-oxo-8-(p-tolyl)-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazine-3-carboxamide946310-79-8C16H19N5O3
- 2-[3-(Morpholin-4-yl)-6-oxopyridazin-1(6H)-yl]-N-(pyridin-2-ylmethyl)acetamide1282098-82-1C16H19N5O3
- N-(2,4-Bis(dimethylamino)pyrimidin-5-yl)benzo[d][1,3]dioxole-5-carboxamide1448036-45-0C16H19N5O3
- 1-(Benzo[d][1,3]dioxol-5-yl)-3-((4-(dimethylamino)-6-methylpyrimidin-2-yl)methyl)urea1797811-74-5C16H19N5O3
- 1-(Benzo[d][1,3]dioxol-5-yl)-3-((2-(dimethylamino)-6-methylpyrimidin-4-yl)methyl)urea1798035-47-8C16H19N5O3
- (3,5-Dimethylisoxazol-4-yl)(2-morpholino-5H-pyrrolo[3,4-d]pyrimidin-6(7H)-yl)methanone2034370-76-6C16H19N5O3
- 5,6-Dimethyl-3-(2-oxo-2-(3-(pyrazin-2-yloxy)pyrrolidin-1-yl)ethyl)pyrimidin-4(3H)-one2034321-26-9C16H19N5O3
- 5,6-Dimethyl-3-(2-oxo-2-(3-(pyridazin-3-yloxy)pyrrolidin-1-yl)ethyl)pyrimidin-4(3H)-one2034434-39-2C16H19N5O3
- (6,7-Dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-2-yl)(3-(pyridazin-3-yloxy)piperidin-1-yl)methanone2034438-48-5C16H19N5O3
- (6,7-Dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-2-yl)(3-(pyrazin-2-yloxy)piperidin-1-yl)methanone2034228-17-4C16H19N5O3
- 4-Methoxy-1-methyl-5-(4-(pyrimidin-2-yl)piperazine-1-carbonyl)pyridin-2(1H)-one2034380-08-8C16H19N5O3
- N-((2-Methoxypyridin-3-yl)methyl)-6-morpholinopyrimidine-4-carboxamide1903167-10-1C16H19N5O3
- 6-(4-((2,6-Dimethylpyrimidin-4-yl)oxy)piperidine-1-carbonyl)pyridazin-3(2H)-one2034472-47-2C16H19N5O3
- N-[3-Methyl-1-(2H-1,2,3-triazol-2-yl)butan-2-yl]-2-(2-oxo-2,3-dihydro-1,3-benzoxazol-3-yl)acetamide2034343-01-4C16H19N5O3
- 4-Acetyl-N-{[4-(dimethylamino)-6-methoxy-1,3,5-triazin-2-yl]methyl}benzamide2034576-38-8C16H19N5O3
- N-(Benzo[d][1,3]dioxol-5-ylmethyl)-4-(2H-1,2,3-triazol-2-yl)piperidine-1-carboxamide2201253-33-8C16H19N5O3
Frequently asked questions
What is the molar mass of C16H19N5O3?
The molar mass of C16H19N5O3 is 329.36 g/mol, calculated from standard atomic weights for 16 carbon atoms, 19 hydrogen atoms, 5 nitrogen atoms and 3 oxygen atoms. The monoisotopic mass is 329.1488 Da.
How many compounds have the formula C16H19N5O3?
CompoundList lists 142 compounds with the molecular formula C16H19N5O3, including 8-(Dimethylamino)-3-methyl-7-(2-phenoxyethyl)-3,7-dihydro-1H-purine-2,6-dione, 8-Benzylamino-7-(2-methoxy-ethyl)-3-methyl-3,7-dihydro-purine-2,6-dione, 3-(3,5-Dimethyl-1H-pyrazol-4-yl)-N'-[(1E)-1-(4-nitrophenyl)ethylidene]propanehydrazide. 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 C16H19N5O3?
C16H19N5O3 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.