Molecular formula
C21H26N2O5S
202 compounds have this formula on CompoundList.
- Molar mass
- 418.51g/mol
- Monoisotopic mass
- 418.1562Da
- Atoms
- 55
- Elements
- 5
- Rings plus double bonds
- 10
The formula C21H26N2O5S describes a molecule made of 21 carbon atoms, 26 hydrogen atoms, 2 nitrogen atoms, 5 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 × 2160.27%12.011 × 21 = 252.231 g/mol
- H Hydrogen × 266.26%1.008 × 26 = 26.208 g/mol
- N Nitrogen × 26.69%14.007 × 2 = 28.014 g/mol
- O Oxygen × 519.11%15.999 × 5 = 79.995 g/mol
- S Sulfur × 17.66%32.06 × 1 = 32.060 g/mol
Look up another formula
Compounds with the formula C21H26N2O5S
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 202 compounds
Methyl 6-(3-ethoxy-4-propoxyphenyl)-8-methyl-4-oxo-3,4-dihydro-2H,6H-pyrimido(2,1-B)(1,3)thiazine-7-carboxylate
CAS 609795-92-8C21H26N2O5S
![2-[Benzyl-(4-methoxyphenyl)sulfonylamino]-N-(oxolan-2-ylmethyl)acetamide chemical structure, C21H26N2O5S, CAS 5741-19-5](/s/AXEBPFWQNYYZQO-UHFFFAOYSA-N.svg)
2-[Benzyl-(4-methoxyphenyl)sulfonylamino]-N-(oxolan-2-ylmethyl)acetamide
CAS 5741-19-5C21H26N2O5S
Opevesostat
CAS 2231294-96-3C21H26N2O5S
![1-(1,3-Benzodioxol-5-ylmethyl)-4-[(5-methoxy-2,4-dimethylphenyl)sulfonyl]piperazine chemical structure, C21H26N2O5S, CAS 682346-74-3](/s/SIZRLIJUWFFBAU-UHFFFAOYSA-N.svg)
1-(1,3-Benzodioxol-5-ylmethyl)-4-[(5-methoxy-2,4-dimethylphenyl)sulfonyl]piperazine
CAS 682346-74-3C21H26N2O5S
4-(4-Methylphenoxy)-N-(4-morpholin-4-ylsulfonylphenyl)butanamide
CAS 867283-84-9C21H26N2O5S
![N-[4-(Azepan-1-ylsulfonyl)phenyl]-2-(2-methoxyphenoxy)acetamide chemical structure, C21H26N2O5S, CAS 433306-39-9](/s/ZCSVXDHEZBOTCK-UHFFFAOYSA-N.svg)
N-[4-(Azepan-1-ylsulfonyl)phenyl]-2-(2-methoxyphenoxy)acetamide
CAS 433306-39-9C21H26N2O5S
![1-(1,3-Benzodioxol-5-ylmethyl)-4-[(4-ethoxy-3-methylphenyl)sulfonyl]piperazine chemical structure, C21H26N2O5S, CAS 838884-93-8](/s/VLFCJAFIEOTCCQ-UHFFFAOYSA-N.svg)
1-(1,3-Benzodioxol-5-ylmethyl)-4-[(4-ethoxy-3-methylphenyl)sulfonyl]piperazine
CAS 838884-93-8C21H26N2O5S
2-(2-Methoxy-N-(4-methylphenyl)sulfonylanilino)-N-(oxolan-2-ylmethyl)acetamide
CAS 432006-87-6C21H26N2O5S
2-(3,4-Dimethoxyphenyl)-N-(4-piperidin-1-ylsulfonylphenyl)acetamide
CAS 600146-49-4C21H26N2O5S
N-(3,4-Dimethoxyphenyl)-1-(4-methylphenyl)sulfonylpiperidine-4-carboxamide
CAS 433941-61-8C21H26N2O5S
![N-[4-(1-Azepanylsulfonyl)phenyl]-2-(4-methoxyphenoxy)acetamide chemical structure, C21H26N2O5S, CAS 511517-79-6](/s/RUSRBPZHGVCHAL-UHFFFAOYSA-N.svg)
N-[4-(1-Azepanylsulfonyl)phenyl]-2-(4-methoxyphenoxy)acetamide
CAS 511517-79-6C21H26N2O5S
4-(Azepan-1-ylsulfonyl)-N-(2,4-dimethoxyphenyl)benzamide
CAS 851289-01-5C21H26N2O5S
![Ethyl 5-(3,4-diethoxyphenyl)-2,7-dimethyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate chemical structure, C21H26N2O5S, CAS 620551-39-5](/s/CRFMIFNYYFNOQB-UHFFFAOYSA-N.svg)
Ethyl 5-(3,4-diethoxyphenyl)-2,7-dimethyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
CAS 620551-39-5C21H26N2O5S
![3-{3-[2-(2-Hydroxyethyl)piperidyl]-3-oxopropyl}-5-[(2-methoxyphenyl)methylene]-1,3-thiazolidine-2,4-dione chemical structure, C21H26N2O5S, CAS 902014-11-3](/s/KYBLGZBTAKZVBJ-JXAWBTAJSA-N.svg)
3-{3-[2-(2-Hydroxyethyl)piperidyl]-3-oxopropyl}-5-[(2-methoxyphenyl)methylene]-1,3-thiazolidine-2,4-dione
CAS 902014-11-3C21H26N2O5S
![3-{3-[2-(2-Hydroxyethyl)piperidyl]-3-oxopropyl}-5-[(4-methoxyphenyl)methylene]-1,3-thiazolidine-2,4-dione chemical structure, C21H26N2O5S, CAS 902031-02-1](/s/VEZTWXGFZHEMCY-JXAWBTAJSA-N.svg)
3-{3-[2-(2-Hydroxyethyl)piperidyl]-3-oxopropyl}-5-[(4-methoxyphenyl)methylene]-1,3-thiazolidine-2,4-dione
CAS 902031-02-1C21H26N2O5S
N-(2-Methoxy-5-morpholin-4-ylsulfonylphenyl)-3-phenylbutanamide
CAS 731783-51-0C21H26N2O5S
![[2-[2-(3,4-Diethoxyphenyl)ethylamino]-2-oxoethyl] 2-methylsulfanylpyridine-3-carboxylate chemical structure, C21H26N2O5S, CAS 878080-92-3](/s/ICNMBBBDBCILPU-UHFFFAOYSA-N.svg)
[2-[2-(3,4-Diethoxyphenyl)ethylamino]-2-oxoethyl] 2-methylsulfanylpyridine-3-carboxylate
CAS 878080-92-3C21H26N2O5S
![Ethyl 4-(4-methoxyphenyl)-2-[3-(morpholin-4-yl)propanamido]thiophene-3-carboxylate chemical structure, C21H26N2O5S, CAS 381688-18-2](/s/BFOXAAYOUPZXAN-UHFFFAOYSA-N.svg)
Ethyl 4-(4-methoxyphenyl)-2-[3-(morpholin-4-yl)propanamido]thiophene-3-carboxylate
CAS 381688-18-2C21H26N2O5S
N-(4-Methyl-3-morpholin-4-ylsulfonylphenyl)-3-(3-methylphenoxy)propanamide
CAS 573653-49-3C21H26N2O5S
2-(N-(4-Ethoxyphenyl)sulfonylanilino)-N-(oxolan-2-ylmethyl)acetamide
CAS 431910-46-2C21H26N2O5S
N-(2,5-Dimethoxyphenyl)-1-(4-methylphenyl)sulfonylpiperidine-4-carboxamide
CAS 433964-52-4C21H26N2O5S
N-(2-Methoxy-5-methylphenyl)-4-methyl-N-(2-morpholin-4-yl-2-oxoethyl)benzenesulfonamide
CAS 352560-15-7C21H26N2O5S
![N-(2-Methoxyethyl)-2-[[2-(2-methoxyphenoxy)acetyl]amino]-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxamide chemical structure, C21H26N2O5S, CAS 381699-60-1](/s/GEBLDEIXCJQLRU-UHFFFAOYSA-N.svg)
N-(2-Methoxyethyl)-2-[[2-(2-methoxyphenoxy)acetyl]amino]-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxamide
CAS 381699-60-1C21H26N2O5S
![N-[2-(2H-1,3-Benzodioxol-5-yl)-2-(morpholin-4-yl)ethyl]-2,5-dimethylbenzene-1-sulfonamide chemical structure, C21H26N2O5S, CAS 887219-06-9](/s/JEBKHRQZNTYHCF-UHFFFAOYSA-N.svg)
N-[2-(2H-1,3-Benzodioxol-5-yl)-2-(morpholin-4-yl)ethyl]-2,5-dimethylbenzene-1-sulfonamide
CAS 887219-06-9C21H26N2O5S
- N-Ethyl-2-(3,4,5-trimethoxybenzamido)-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxamide335421-30-2C21H26N2O5S
- Ethyl 4-(3,4-dimethoxyphenyl)-2-[(2-pyrrolidin-1-ylacetyl)amino]thiophene-3-carboxylate670268-19-6C21H26N2O5S
- 2-(4-Methoxyphenyl)-N-(4-(2-morpholino-2-oxoethyl)phenyl)ethanesulfonamide1060323-49-0C21H26N2O5S
- 9H-Thioxanthen-9-one, 1-((2-(diethylamino)ethyl)amino)-4-(hydroxymethyl)-, N-oxide, formate64265-19-6C21H26N2O5S
- 4-Ethoxy-3-methyl-N-(2-oxo-2-(2-phenylmorpholino)ethyl)benzenesulfonamide953962-57-7C21H26N2O5S
- 2-(4-Methoxyphenyl)-N-(2-oxo-2-(2-phenylmorpholino)ethyl)ethanesulfonamide953957-09-0C21H26N2O5S
- N-[1-(2,2-Dimethylpropanoyl)-2,3-dihydro-1H-indol-6-yl]-2,5-dimethoxybenzene-1-sulfonamide1021208-80-9C21H26N2O5S
- N-[1-(2,2-Dimethylpropanoyl)-2,3-dihydro-1H-indol-6-yl]-3,4-dimethoxybenzene-1-sulfonamide1021210-35-4C21H26N2O5S
- 1-Acetyl-N-(2-(4-ethoxyphenoxy)ethyl)-2-methylindoline-5-sulfonamide1105204-68-9C21H26N2O5S
- 2-(3,4-Dimethoxyphenyl)-N-[2-(1,2,3,4-tetrahydroisoquinoline-2-sulfonyl)ethyl]acetamide922036-53-1C21H26N2O5S
- 2,4-Dimethoxy-N-(2-(propylsulfonyl)-1,2,3,4-tetrahydroisoquinolin-7-yl)benzamide954663-60-6C21H26N2O5S
- 2-(4-Methoxyphenoxy)-N-(2-(propylsulfonyl)-1,2,3,4-tetrahydroisoquinolin-7-yl)acetamide954709-47-8C21H26N2O5S
- N-(2-Isobutyryl-1,2,3,4-tetrahydroisoquinolin-7-yl)-2,5-dimethoxybenzenesulfonamide955695-00-8C21H26N2O5S
- N-(2-Isobutyryl-1,2,3,4-tetrahydroisoquinolin-7-yl)-2,4-dimethoxybenzenesulfonamide955648-87-0C21H26N2O5S
- 2-(4-Methoxyphenoxy)-N-[1-(propane-1-sulfonyl)-1,2,3,4-tetrahydroquinolin-7-yl]acetamide946292-41-7C21H26N2O5S
- 4-Propoxy-N-(3,3,5-trimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-8-yl)benzenesulfonamide922097-30-1C21H26N2O5S
- N-(3,3-Dimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-8-yl)-4-ethoxy-3,5-dimethylbenzenesulfonamide922022-02-4C21H26N2O5S
- 2-Methoxy-4,5-dimethyl-N-(3,3,5-trimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-7-yl)benzenesulfonamide922103-11-5C21H26N2O5S
- 2-Ethoxy-5-methyl-N-(3,3,5-trimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-7-yl)benzenesulfonamide921908-70-5C21H26N2O5S
- 5-Ethyl-2-methoxy-N-(3,3,5-trimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-7-yl)benzenesulfonamide922076-77-5C21H26N2O5S
- 2-(4-Methoxyphenyl)-N-(3,3,5-trimethyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-7-yl)ethanesulfonamide922023-59-4C21H26N2O5S
- 2-Methoxy-N-(1-(2-methoxyacetyl)-1,2,3,4-tetrahydroquinolin-7-yl)-4,5-dimethylbenzenesulfonamide1171992-85-0C21H26N2O5S
- 2-Ethoxy-N-[1-(2-methoxyacetyl)-1,2,3,4-tetrahydroquinolin-7-yl]-5-methylbenzene-1-sulfonamide1171067-10-9C21H26N2O5S
- Ethyl 4-(4-methoxyphenyl)-5-methyl-2-(2-morpholinoacetamido)thiophene-3-carboxylate683780-14-5C21H26N2O5S
- 2-Methoxy-4,5-dimethyl-N-(2-oxo-2-(2-phenylmorpholino)ethyl)benzenesulfonamide954039-05-5C21H26N2O5S
- 2-[N-(Benzenesulfonyl)-2-ethoxyanilino]-N-(oxolan-2-ylmethyl)acetamide362000-00-8C21H26N2O5S
- 2-(4-Methoxy-N-(4-methylphenyl)sulfonylanilino)-N-(oxolan-2-ylmethyl)acetamide5669-53-4C21H26N2O5S
- Ethyl 2-(2,2-dimethylpropanoylamino)-5-[(3-methoxyphenyl)carbamoyl]-4-methylthiophene-3-carboxylate330952-21-1C21H26N2O5S
- Methyl 5-(diethylcarbamoyl)-2-{[(4-ethoxyphenyl)carbonyl]amino}-4-methylthiophene-3-carboxylate420089-60-7C21H26N2O5S
- 2-[N-(Benzenesulfonyl)-2,5-dimethoxyanilino]-N-cyclopentylacetamide335416-29-0C21H26N2O5S
- Ethyl 2-[(2,2-dimethylpropanoyl)amino]-5-[(4-methoxyanilino)carbonyl]-4-methyl-3-thiophenecarboxylate330559-22-3C21H26N2O5S
- Isopropyl 6-(4-ethoxy-3-methoxyphenyl)-8-methyl-4-oxo-2,3,4,6-tetrahydropyrimido[2,1-b][1,3]thiazine-7-carboxylate620156-88-9C21H26N2O5S
- 2,4-Dimethoxy-N-[4-(4-methylpiperidin-1-yl)sulfonylphenyl]benzamide510740-57-5C21H26N2O5S
- Ethyl 2-({[4-isopropyl(methylsulfonyl)anilino]acetyl}amino)benzoate425626-85-3C21H26N2O5S
- 2-(4-Methoxyphenoxy)-N-{4-[(4-methyl-1-piperidinyl)sulfonyl]phenyl}acetamide497081-58-0C21H26N2O5S
- 1-(1,3-Benzodioxol-5-ylmethyl)-4-[(4-methoxy-2,5-dimethylphenyl)sulfonyl]piperazine701931-41-1C21H26N2O5S
- 2-{[4-(Dipropylsulfamoyl)phenyl]carbamoyl}phenyl acetate669704-78-3C21H26N2O5S
- 2-Methoxyethyl 8-methyl-4-oxo-6-(4-propoxyphenyl)-2H,3H,4H,6H-pyrimido[2,1-b][1,3]thiazine-7-carboxylate608490-35-3C21H26N2O5S
- 2-Methylpropyl 6-(3,4-dimethoxyphenyl)-8-methyl-4-oxo-3,6-dihydro-2H-pyrimido[2,1-b][1,3]thiazine-7-carboxylate609793-76-2C21H26N2O5S
- N-(3,4-Dimethoxyphenyl)-N-(2-oxo-2-piperidin-1-ylethyl)benzenesulfonamide333450-70-7C21H26N2O5S
- Isopropyl 5-[(diethylamino)carbonyl]-2-{[3-(2-furyl)acryloyl]amino}-4-methyl-3-thiophenecarboxylate543716-56-9C21H26N2O5S
- 3,4,5-Triethoxy-N-[(3-methoxyphenyl)carbamothioyl]benzamide80617-52-3C21H26N2O5S
- 1-(1,3-Benzodioxol-5-ylmethyl)-4-(4-methoxy-2,3-dimethylphenyl)sulfonylpiperazine691381-46-1C21H26N2O5S
- N-(2-Methoxyethyl)-2-(2-(4-methoxyphenoxy)acetamido)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide380871-26-1C21H26N2O5S
- 4-((2,6-Dimethylmorpholino)sulfonyl)-N-(4-ethoxyphenyl)benzamide325748-00-3C21H26N2O5S
- Ethyl 6-(3,4-diethoxyphenyl)-8-methyl-4-oxo-3,4-dihydro-2H,6H-pyrimido[2,1-b][1,3]thiazine-7-carboxylate620156-93-6C21H26N2O5S
- 1-(1,3-Benzodioxol-5-ylmethyl)-4-(2-ethoxy-5-methylphenyl)sulfonylpiperazine873580-03-1C21H26N2O5S
- 1-[(2H-1,3-Benzodioxol-5-yl)methyl]-4-(3-ethyl-4-methoxybenzenesulfonyl)piperazine879052-42-3C21H26N2O5S
- N-(2,4-Dimethoxyphenyl)-4-methyl-3-(piperidin-1-ylsulfonyl)benzamide866232-37-3C21H26N2O5S
- N-[4-(Cyclohexylsulfamoyl)phenyl]-2-(4-methoxyphenoxy)acetamide497081-61-5C21H26N2O5S
- 3,4,5-Triethoxy-N-[(2-methoxyphenyl)carbamothioyl]benzamide80617-51-2C21H26N2O5S
- N-(2,4-Dimethoxyphenyl)-1-(4-methylphenyl)sulfonylpiperidine-4-carboxamide433966-40-6C21H26N2O5S
- 3,4-Diethoxy-N-(4-pyrrolidin-1-ylsulfonylphenyl)benzamide510736-07-9C21H26N2O5S
- 2-[4-(Cyclohexylsulfamoyl)phenoxy]-N-(4-methoxyphenyl)acetamide664318-41-6C21H26N2O5S
- N-{[5-(Butan-2-yl)-2-hydroxyphenyl]carbamothioyl}-3,4,5-trimethoxybenzamide356085-67-1C21H26N2O5S
- N-[4-(Cyclohexylsulfamoyl)phenyl]-3,4-dimethoxybenzamide827617-23-2C21H26N2O5S
- 2-(3,4-Dimethoxybenzamido)-N-(2-methoxyethyl)-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxamide380877-27-0C21H26N2O5S
- 2-Methylpropyl 5-(3,4-dimethoxyphenyl)-2,7-dimethyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate839704-29-9C21H26N2O5S
- N-[1-(3,4-Dimethoxyphenyl)propan-2-yl]-4-(2-oxopyrrolidin-1-yl)benzenesulfonamide893776-14-2C21H26N2O5S
- 3-{[4-Ethyl-5-methyl-3-(morpholin-4-ylcarbonyl)thiophen-2-yl]carbamoyl}bicyclo[2.2.1]hept-5-ene-2-carboxylic acid1005148-66-2C21H26N2O5S
- 2,5-Dimethoxy-N-(2-(5-methoxy-2-methyl-1H-indol-3-yl)ethyl)-4-methylbenzenesulfonamide927637-75-0C21H26N2O5S
- N-{4-[(Isopropylamino)sulfonyl]phenyl}-4-(tetrahydro-2-furanylmethoxy)benzamide941858-32-8C21H26N2O5S
- 3H-Indolium, 2-[2-[(4-ethoxyphenyl)amino]ethenyl]-1,3,3-trimethyl-, sulfate (1:1)70353-84-3C21H26N2O5S
- Methyl 5-isopropyl-2-({[4-(4-methoxyphenyl)tetrahydro-2H-pyran-4-yl]carbonyl}amino)-1,3-thiazole-4-carboxylate1401591-44-3C21H26N2O5S
- 6-Cbz-2,6-diaza-spiro[3.4]octane tosylate2305079-75-6C21H26N2O5S
- 2-[4-[Benzyl(methyl)sulfamoyl]phenoxy]-N-(oxolan-2-ylmethyl)acetamide709003-54-3C21H26N2O5S
- Ethyl 2-{[N-(3,5-dimethylphenyl)-N-(methylsulfonyl)alanyl]amino}benzoate1008639-97-1C21H26N2O5S
- Methyl 6-(4-isobutoxy-3-methoxyphenyl)-8-methyl-4-oxo-3,4-dihydro-2H,6H-pyrimido[2,1-b][1,3]thiazine-7-carboxylate620157-40-6C21H26N2O5S
- Methyl 6-(4-butoxy-3-methoxyphenyl)-8-methyl-4-oxo-3,4-dihydro-2H,6H-pyrimido[2,1-b][1,3]thiazine-7-carboxylate620157-20-2C21H26N2O5S
- 2-Methoxyethyl 5-(4-ethoxyphenyl)-2-ethyl-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate620554-29-2C21H26N2O5S
- 2-Methoxy-N-(4-methoxy-3-(2-oxopiperidin-1-yl)phenyl)-4,5-dimethylbenzenesulfonamide941939-90-8C21H26N2O5S
- N-(2-Hydroxy-2-phenylethyl)-1-[(4-methoxyphenyl)sulfonyl]-3-piperidinecarboxamide921085-45-2C21H26N2O5S
- N-(1-Isobutyl-2-oxo-1,2,3,4-tetrahydroquinolin-6-yl)-2,4-dimethoxybenzenesulfonamide941906-75-8C21H26N2O5S
- 3,4-Dimethoxy-N-((1-tosylpyrrolidin-2-yl)methyl)benzamide887862-38-6C21H26N2O5S
- N-(3-(2-Phenylmorpholino)propyl)-2,3-dihydrobenzo[b][1,4]dioxine-6-sulfonamide954049-32-2C21H26N2O5S
- 2-(3-Methoxyphenoxy)-N-[1-(propane-1-sulfonyl)-1,2,3,4-tetrahydroquinolin-7-yl]acetamide946351-51-5C21H26N2O5S
Frequently asked questions
What is the molar mass of C21H26N2O5S?
The molar mass of C21H26N2O5S is 418.51 g/mol, calculated from standard atomic weights for 21 carbon atoms, 26 hydrogen atoms, 2 nitrogen atoms, 5 oxygen atoms and 1 sulfur atom. The monoisotopic mass is 418.1562 Da.
How many compounds have the formula C21H26N2O5S?
CompoundList lists 202 compounds with the molecular formula C21H26N2O5S, including Methyl 6-(3-ethoxy-4-propoxyphenyl)-8-methyl-4-oxo-3,4-dihydro-2H,6H-pyrimido(2,1-B)(1,3)thiazine-7-carboxylate, 2-[Benzyl-(4-methoxyphenyl)sulfonylamino]-N-(oxolan-2-ylmethyl)acetamide, Opevesostat. 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 C21H26N2O5S?
C21H26N2O5S 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.