Molecular formula
C20H22N2O5
219 compounds have this formula on CompoundList.
- Molar mass
- 370.40g/mol
- Monoisotopic mass
- 370.1529Da
- Atoms
- 49
- Elements
- 4
- Rings plus double bonds
- 11
The formula C20H22N2O5 describes a molecule made of 20 carbon atoms, 22 hydrogen atoms, 2 nitrogen atoms and 5 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 × 2064.85%12.011 × 20 = 240.220 g/mol
- H Hydrogen × 225.99%1.008 × 22 = 22.176 g/mol
- N Nitrogen × 27.56%14.007 × 2 = 28.014 g/mol
- O Oxygen × 521.60%15.999 × 5 = 79.995 g/mol
Look up another formula
Compounds with the formula C20H22N2O5
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 101 to 200 of 219 compounds
![N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-8-yl)-2-(3-methoxyphenoxy)acetamide chemical structure, C20H22N2O5, CAS 921585-03-7](/s/BKFYZZQZEVECJU-UHFFFAOYSA-N.svg)
N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-8-yl)-2-(3-methoxyphenoxy)acetamide
CAS 921585-03-7C20H22N2O5
![N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-8-yl)-2-(4-methoxyphenoxy)acetamide chemical structure, C20H22N2O5, CAS 921835-57-6](/s/KOQDFDPUOQLJSS-UHFFFAOYSA-N.svg)
N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-8-yl)-2-(4-methoxyphenoxy)acetamide
CAS 921835-57-6C20H22N2O5
![N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-7-yl)-2-(2-methoxyphenoxy)acetamide chemical structure, C20H22N2O5, CAS 921842-97-9](/s/FMYUKAFPORORDO-UHFFFAOYSA-N.svg)
N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-7-yl)-2-(2-methoxyphenoxy)acetamide
CAS 921842-97-9C20H22N2O5
Ethyl 4-((2-(furan-2-carbonyl)-1,2,3,4-tetrahydroisoquinolin-7-yl)amino)-4-oxobutanoate
CAS 1207053-52-8C20H22N2O5
![N-((1-(Furan-3-carbonyl)piperidin-4-yl)methyl)-2,3-dihydrobenzo[b][1,4]dioxine-2-carboxamide chemical structure, C20H22N2O5, CAS 1396814-56-4](/s/FOGMTVQDKNURCS-UHFFFAOYSA-N.svg)
N-((1-(Furan-3-carbonyl)piperidin-4-yl)methyl)-2,3-dihydrobenzo[b][1,4]dioxine-2-carboxamide
CAS 1396814-56-4C20H22N2O5
1-(2,3-Dimethoxyphenyl)-3-(4-(2-methoxyphenoxy)but-2-yn-1-yl)urea
CAS 1426314-66-0C20H22N2O5
![1-{8-[2-(2H-1,3-Benzodioxol-5-yl)acetyl]-8-azabicyclo[3.2.1]octan-3-yl}pyrrolidine-2,5-dione chemical structure, C20H22N2O5, CAS 1903647-55-1](/s/HAMNNQXPGFCVGL-UHFFFAOYSA-N.svg)
1-{8-[2-(2H-1,3-Benzodioxol-5-yl)acetyl]-8-azabicyclo[3.2.1]octan-3-yl}pyrrolidine-2,5-dione
CAS 1903647-55-1C20H22N2O5
![N-(Benzo[d][1,3]dioxol-5-ylmethyl)-2-((tetrahydro-2H-pyran-4-yl)methoxy)isonicotinamide chemical structure, C20H22N2O5, CAS 2034296-28-9](/s/DCBUUWDJHAWRGK-UHFFFAOYSA-N.svg)
N-(Benzo[d][1,3]dioxol-5-ylmethyl)-2-((tetrahydro-2H-pyran-4-yl)methoxy)isonicotinamide
CAS 2034296-28-9C20H22N2O5
![Methyl N-[(benzyloxy)carbonyl]glycylphenylalaninate chemical structure, C20H22N2O5, CAS 6206-42-4](/s/IPSRQHLQGBVCPA-UHFFFAOYSA-N.svg)
Methyl N-[(benzyloxy)carbonyl]glycylphenylalaninate
CAS 6206-42-4C20H22N2O5
![Benzyl N-[(benzyloxy)carbonyl]alanylglycinate chemical structure, C20H22N2O5, CAS 16305-78-5](/s/KGDXJTCTVJEABL-UHFFFAOYSA-N.svg)
Benzyl N-[(benzyloxy)carbonyl]alanylglycinate
CAS 16305-78-5C20H22N2O5
![L-Glutamine,n2-[(phenylmethoxy)carbonyl]-,phenylmethyl ester chemical structure, C20H22N2O5, CAS 95700-16-6](/s/NNAVHDLGFPHCOB-UHFFFAOYSA-N.svg)
L-Glutamine,n2-[(phenylmethoxy)carbonyl]-,phenylmethyl ester
CAS 95700-16-6C20H22N2O5
![Methyl 5-{[(4-methoxyphenyl)carbonyl]amino}-2-(morpholin-4-yl)benzoate chemical structure, C20H22N2O5, CAS 682333-81-9](/s/DSRLIXBANKLGMS-UHFFFAOYSA-N.svg)
Methyl 5-{[(4-methoxyphenyl)carbonyl]amino}-2-(morpholin-4-yl)benzoate
CAS 682333-81-9C20H22N2O5
N-((4-(4-Methoxyphenyl)tetrahydro-2H-pyran-4-yl)methyl)-4-nitrobenzamide
CAS 690692-31-0C20H22N2O5
![Methyl 3-{[(6,7-dimethoxy-3,4-dihydroisoquinolin-2(1H)-yl)carbonyl]amino}benzoate chemical structure, C20H22N2O5, CAS 919735-95-8](/s/CPDPOFUMWXWRMO-UHFFFAOYSA-N.svg)
Methyl 3-{[(6,7-dimethoxy-3,4-dihydroisoquinolin-2(1H)-yl)carbonyl]amino}benzoate
CAS 919735-95-8C20H22N2O5
![Methyl 3-[(2-methoxybenzoyl)amino]-4-morpholin-4-ylbenzoate chemical structure, C20H22N2O5, CAS 895094-54-9](/s/JKXPXEAZEOQRRO-UHFFFAOYSA-N.svg)
Methyl 3-[(2-methoxybenzoyl)amino]-4-morpholin-4-ylbenzoate
CAS 895094-54-9C20H22N2O5
Z-D-Ala-Phe-OH
CAS 19542-44-0C20H22N2O5
2-(Indolin-1-ylmethyl)-5-(2-morpholino-2-oxoethoxy)-4H-pyran-4-one
CAS 898440-19-2C20H22N2O5
Ethyl 2-methyl-5-(2-morpholino-2-oxoacetyl)-4-phenyl-1H-pyrrole-3-carboxylate
CAS 1001763-43-4C20H22N2O5
![3,5-Dimethoxy-N-[3-methoxy-4-(2-oxopyrrolidin-1-yl)phenyl]benzamide chemical structure, C20H22N2O5, CAS 941993-02-8](/s/HWONKCRJAVUTHS-UHFFFAOYSA-N.svg)
3,5-Dimethoxy-N-[3-methoxy-4-(2-oxopyrrolidin-1-yl)phenyl]benzamide
CAS 941993-02-8C20H22N2O5
![2,6-Dimethoxy-N-[3-methoxy-4-(2-oxopyrrolidin-1-yl)phenyl]benzamide chemical structure, C20H22N2O5, CAS 941956-94-1](/s/GBDAFGQYNSSZPD-UHFFFAOYSA-N.svg)
2,6-Dimethoxy-N-[3-methoxy-4-(2-oxopyrrolidin-1-yl)phenyl]benzamide
CAS 941956-94-1C20H22N2O5
![2,4-Dimethoxy-N-[3-methoxy-4-(2-oxopyrrolidin-1-yl)phenyl]benzamide chemical structure, C20H22N2O5, CAS 941993-14-2](/s/OYTIKEQMDLYFMI-UHFFFAOYSA-N.svg)
2,4-Dimethoxy-N-[3-methoxy-4-(2-oxopyrrolidin-1-yl)phenyl]benzamide
CAS 941993-14-2C20H22N2O5
![N-[3-Methoxy-4-(2-oxopyrrolidin-1-yl)phenyl]-2-(2-methoxyphenoxy)acetamide chemical structure, C20H22N2O5, CAS 941933-63-7](/s/POOXXRUPKYBWKO-UHFFFAOYSA-N.svg)
N-[3-Methoxy-4-(2-oxopyrrolidin-1-yl)phenyl]-2-(2-methoxyphenoxy)acetamide
CAS 941933-63-7C20H22N2O5
![N-[3-Methoxy-4-(2-oxopyrrolidin-1-yl)phenyl]-2-(4-methoxyphenoxy)acetamide chemical structure, C20H22N2O5, CAS 938786-27-7](/s/OSCJJDUDZRBEQP-UHFFFAOYSA-N.svg)
N-[3-Methoxy-4-(2-oxopyrrolidin-1-yl)phenyl]-2-(4-methoxyphenoxy)acetamide
CAS 938786-27-7C20H22N2O5
![N-[4-Methoxy-3-(2-oxopyrrolidin-1-yl)phenyl]-2-(3-methoxyphenoxy)acetamide chemical structure, C20H22N2O5, CAS 941957-61-5](/s/BBCLDLROIFCPCT-UHFFFAOYSA-N.svg)
N-[4-Methoxy-3-(2-oxopyrrolidin-1-yl)phenyl]-2-(3-methoxyphenoxy)acetamide
CAS 941957-61-5C20H22N2O5
- N-[4-Methoxy-3-(2-oxopyrrolidin-1-yl)phenyl]-2-(4-methoxyphenoxy)acetamide922977-75-1C20H22N2O5
- 6-[4-(2-Hydroxybenzoylamino)benzoylamino]hexanoic acid209961-30-8C20H22N2O5
- (S)-4-Benzyloxycarbonylamino-4-carbamoylbutyric acid benzyl ester139937-97-6C20H22N2O5
- N-(4-Ethyl-5-oxo-2,3,4,5-tetrahydrobenzo[f][1,4]oxazepin-7-yl)-3,5-dimethoxybenzamide922128-20-9C20H22N2O5
- N-(4-Ethyl-5-oxo-2,3,4,5-tetrahydro-1,4-benzoxazepin-7-yl)-2,6-dimethoxybenzamide922128-32-3C20H22N2O5
- N-(4-Ethyl-5-oxo-2,3,4,5-tetrahydrobenzo[f][1,4]oxazepin-7-yl)-3,4-dimethoxybenzamide922001-69-2C20H22N2O5
- N-(4-Ethyl-5-oxo-2,3,4,5-tetrahydrobenzo[f][1,4]oxazepin-7-yl)-2-(3-methoxyphenoxy)acetamide922128-78-7C20H22N2O5
- N-(4-Ethyl-5-oxo-2,3,4,5-tetrahydrobenzo[f][1,4]oxazepin-7-yl)-2-(4-methoxyphenoxy)acetamide922055-31-0C20H22N2O5
- 3,4,5-Trimethoxy-N-(1-methyl-2-oxo-1,2,3,4-tetrahydroquinolin-6-yl)benzamide921913-50-0C20H22N2O5
- 3,4,5-Trimethoxy-N-[2-(2-oxopyrrolidin-1-yl)phenyl]benzamide1036675-03-2C20H22N2O5
- N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-7-yl)-2,6-dimethoxybenzamide921816-89-9C20H22N2O5
- 2-(3,4-Dimethoxyphenyl)-N-(4-methyl-5-oxo-2,3,4,5-tetrahydrobenzo[f][1,4]oxazepin-7-yl)acetamide922000-97-3C20H22N2O5
- N-(4-Ethyl-5-oxo-2,3,4,5-tetrahydro-1,4-benzoxazepin-7-yl)-2,4-dimethoxybenzamide922128-63-0C20H22N2O5
- 1-[(1-Cyano-1,2-dimethylpropyl)carbamoyl]ethyl 6-methyl-4-oxo-4H-chromene-2-carboxylate1043117-24-3C20H22N2O5
- 7-{[3-(3,4-Dimethoxyphenyl)-3-oxopropyl]amino}-2-methyl-2H-1,4-benzoxazin-3(4H)-one1172291-86-9C20H22N2O5
- 2-(7,8-Dimethoxy-4-methyl-2-oxo-2H-chromen-3-yl)-N-[2-(1H-pyrrol-1-yl)ethyl]acetamide1324060-20-9C20H22N2O5
- 2-(5,7-Dimethoxy-4-methyl-2-oxo-2H-chromen-3-yl)-N-[2-(1H-pyrrol-1-yl)ethyl]acetamide1324060-54-9C20H22N2O5
- N1-(3-(benzo[d][1,3]dioxol-5-yl)-3-hydroxypropyl)-N2-(2,3-dimethylphenyl)oxalamide1448033-81-5C20H22N2O5
- N1-(benzo[d][1,3]dioxol-5-ylmethyl)-N2-(2-methoxy-2-(o-tolyl)ethyl)oxalamide1797281-36-7C20H22N2O5
- Methyl 4-(2-((2-methoxy-2-(o-tolyl)ethyl)amino)-2-oxoacetamido)benzoate1797159-96-6C20H22N2O5
- N1-(benzo[d][1,3]dioxol-5-yl)-N2-(5-hydroxy-3-phenylpentyl)oxalamide1790195-62-8C20H22N2O5
- N1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-N2-(2-methoxy-2-(o-tolyl)ethyl)oxalamide1704665-32-6C20H22N2O5
- Methyl 2-(6-((tetrahydro-2H-pyran-4-yl)methoxy)nicotinamido)benzoate2034278-48-1C20H22N2O5
- N-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)-6-((tetrahydro-2H-pyran-4-yl)methoxy)nicotinamide2034241-57-9C20H22N2O5
- Benzyl 2-(2-((tetrahydro-2H-pyran-4-yl)oxy)isonicotinamido)acetate2034447-90-8C20H22N2O5
- Methyl 2-(N-methyl-6-((tetrahydrofuran-2-yl)methoxy)nicotinamido)benzoate2034428-96-9C20H22N2O5
- N-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)-2-((tetrahydro-2H-pyran-4-yl)methoxy)isonicotinamide2034443-46-2C20H22N2O5
- 1-(2-(Benzofuran-2-yl)-2-methoxyethyl)-3-(2,3-dimethoxyphenyl)urea2034207-85-5C20H22N2O5
- Methyl 4-(2-((tetrahydro-2H-pyran-4-yl)methoxy)isonicotinamido)benzoate2034242-93-6C20H22N2O5
- 3-[6-(3,3-Diethoxyprop-1-ynyl)-3-oxo-1H-isoindol-2-yl]piperidine-2,6-dione2413038-21-6C20H22N2O5
- 2-[[(2-Naphthalen-1-yloxyacetyl)amino]carbamoyl]cyclohexane-1-carboxylic acid874374-59-1C20H22N2O5
- Methyl 3-(4-methoxybenzamido)-4-morpholinobenzoate895094-64-1C20H22N2O5
- Methyl 2-(morpholin-4-yl)-5-[(phenoxyacetyl)amino]benzoate792930-02-0C20H22N2O5
- [(1-Cyanocyclohexyl)carbamoyl]methyl 3-(methoxymethyl)-1-benzofuran-2-carboxylate879756-97-5C20H22N2O5
- 3,5-Dimethoxy-N-[1-(3-methoxyphenyl)-5-oxopyrrolidin-3-yl]benzamide896271-54-8C20H22N2O5
- Benzyl isopropyl(3-(2-nitrophenyl)-3-oxopropyl)carbamate177611-35-7C20H22N2O5
- 3,4-Dimethoxy-N-[1-(3-methoxyphenyl)-5-oxopyrrolidin-3-yl]benzamide896271-47-9C20H22N2O5
- 3,4-Dimethoxy-N-[1-(4-methoxyphenyl)-5-oxopyrrolidin-3-yl]benzamide896276-77-0C20H22N2O5
- N-[1-(3,4-Dimethoxyphenyl)-5-oxopyrrolidin-3-yl]-3-methoxybenzamide900996-61-4C20H22N2O5
- N-[1-(3,4-Dimethoxyphenyl)-5-oxopyrrolidin-3-yl]-4-methoxybenzamide900996-62-5C20H22N2O5
- 2-(2-Methoxyphenoxy)-N-[1-(3-methoxyphenyl)-5-oxopyrrolidin-3-yl]acetamide896272-83-6C20H22N2O5
- 2-Methoxy-N-[2-methoxy-5-(morpholin-4-ylcarbonyl)phenyl]benzamide1266377-04-1C20H22N2O5
- N-(2,4-Dimethoxyphenyl)-4,7-dimethoxy-1-methyl-1H-indole-2-carboxamide1351702-96-9C20H22N2O5
- (1-Benzylpiperidin-4-yl)methyl 4-nitrophenyl carbonate1160221-47-5C20H22N2O5
- N-[2-(3,4-Dimethoxyphenyl)-2-hydroxyethyl]-6-methoxy-1H-indole-2-carboxamide1797965-43-5C20H22N2O5
- 2-(7,8-Dimethoxy-2-oxo-1,2-dihydro-3H-3-benzazepin-3-yl)-N-[2-(furan-2-yl)ethyl]acetamide1574397-57-1C20H22N2O5
- 4-Methoxy-1-phenyl-5-(1,4-dioxa-8-azaspiro[4.5]decane-8-carbonyl)pyridin-2(1H)-one1795417-43-4C20H22N2O5
- 6-Benzoxazoleethylamine, beta-methyl-2-phenyl-, hemisuccinate62143-74-2C20H22N2O5
- L-Ornithine, N2-acetyl-N5-(3-phenoxybenzoyl)-83799-95-5C20H22N2O5
- 1-[2-(Dimethylamino)ethyl]-5-(furan-2-yl)-3-hydroxy-4-(3-methoxybenzoyl)-2,5-dihydro-1H-pyrrol-2-oneC20H22N2O5
- Phthalimidine, 2-(4-(1-pyrrolidinyl)-2-butynyl)-, fumarate (1:1)14074-90-9C20H22N2O5
- 2-Propenamide, N-(2-(3,4-dimethoxyphenyl)ethyl)-2-methyl-3-(4-nitrophenyl)-76691-31-1C20H22N2O5
- N2-Benzoyl-N5-[(phenylmethoxy)carbonyl]-L-ornithine1946-83-4C20H22N2O5
- 2-(5-Methoxy-1H-indol-1-yl)-N-(3,4,5-trimethoxyphenyl)acetamide1081121-75-6C20H22N2O5
- Ethyl 4-(4-(benzylamino)-3-nitrophenyl)-3-methyl-4-oxo-butanoate1338058-47-1C20H22N2O5
- Methyl 1-(1-((benzyloxy)carbonyl)piperidin-4-yl)-2-oxo-1,2-dihydropyridine-3-carboxylate1797436-49-7C20H22N2O5
- 1H-Indole-3-ethanamine, N-[(3-methoxyphenyl)methyl]-, ethanedioate (1:1)C20H22N2O5
- 7-(2,4-Dimethoxybenzyloxy)-5-isopropoxy-3,4-dihydroquinazolin-4-one692059-64-6C20H22N2O5
- Benzyl ((2S,3S)-2-(hydroxymethyl)-1-(4-methoxyphenyl)-2-methyl-4-oxoazetidin-3-yl)carbamate188881-52-9C20H22N2O5
- Ethyl 2-[6-(N-Boc-amino)naphtho[1,2-d]isoxazol-1-yl]acetate2883704-43-4C20H22N2O5
- tert-Butyl 3-[2-(2,6-Dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl]acrylate3064044-95-4C20H22N2O5
- 6-Methoxy-2-phenyl-8-phenyldiazenyl-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-7-ol3068-27-7C20H22N2O5
- 2-[[(2-Naphthalen-2-yloxyacetyl)amino]carbamoyl]cyclohexane-1-carboxylic acid913249-67-9C20H22N2O5
- ((Benzyloxy)carbonyl)-D-phenylalanyl-D-alanine16088-38-3C20H22N2O5
- Diethyl [phenyl(phenylcarbamoyl)amino]propanedioate56599-01-0C20H22N2O5
- 1-Methyl-4-(2-benzofuryl)-2-allyliminopyrrolidine hydrogen fumarate94221-82-6C20H22N2O5
- [4-[[4-[(2-Methylpropan-2-yl)oxycarbonylamino]phenyl]carbamoyl]phenyl] acetate1098068-26-8C20H22N2O5
- [2-[[4-[(2-Methylpropan-2-yl)oxycarbonylamino]phenyl]carbamoyl]phenyl] acetate1098069-06-7C20H22N2O5
- 8-Benzyl-4-(furan-2-carbonyl)-1-oxa-4,8-diazaspiro[4.5]decane-3-carboxylic acid1326808-53-0C20H22N2O5
- 5-[Hydroxy(phenyl)methylene]-2,2-dimethyl-1,3-dioxane-4,6-dione compound with N,N-dimethyl-4-pyridinamine (1:1)462101-61-7C20H22N2O5
- 4-[(trans-4-{[(3-Hydroxyphenyl)acetyl]amino}tetrahydro-2H-pyran-3-yl)oxy]benzamide1783256-97-2C20H22N2O5
- 2-Methoxy-4-[[6-methoxy-7-(2-methoxyethoxy)-4-quinolinyl]oxy]benzenamine1504561-27-6C20H22N2O5
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 1-[(cyclopropylcarbamoyl)methyl]cyclohexane-1-carboxylate2248393-45-3C20H22N2O5
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 1-cycloheptyl-5-oxopyrrolidine-3-carboxylate2248299-08-1C20H22N2O5
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 2-(pyrrolidine-1-carbonyl)cyclohexane-1-carboxylate2248353-97-9C20H22N2O5
- 2-(2-{[(Benzyloxy)carbonyl]amino}-2-methylpropanamido)-2-phenylacetic acid15030-90-7C20H22N2O5
Frequently asked questions
What is the molar mass of C20H22N2O5?
The molar mass of C20H22N2O5 is 370.40 g/mol, calculated from standard atomic weights for 20 carbon atoms, 22 hydrogen atoms, 2 nitrogen atoms and 5 oxygen atoms. The monoisotopic mass is 370.1529 Da.
How many compounds have the formula C20H22N2O5?
CompoundList lists 219 compounds with the molecular formula C20H22N2O5, including N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-8-yl)-2-(3-methoxyphenoxy)acetamide, N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-8-yl)-2-(4-methoxyphenoxy)acetamide, N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-7-yl)-2-(2-methoxyphenoxy)acetamide. 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 C20H22N2O5?
C20H22N2O5 has a degree of unsaturation of 11. 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.