Molecular formula
C20H20N4O2
336 compounds have this formula on CompoundList.
- Molar mass
- 348.41g/mol
- Monoisotopic mass
- 348.1586Da
- Atoms
- 46
- Elements
- 4
- Rings plus double bonds
- 13
The formula C20H20N4O2 describes a molecule made of 20 carbon atoms, 20 hydrogen atoms, 4 nitrogen atoms and 2 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 × 2068.95%12.011 × 20 = 240.220 g/mol
- H Hydrogen × 205.79%1.008 × 20 = 20.160 g/mol
- N Nitrogen × 416.08%14.007 × 4 = 56.028 g/mol
- O Oxygen × 29.18%15.999 × 2 = 31.998 g/mol
Look up another formula
Compounds with the formula C20H20N4O2
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 336 compounds
![5-{[2-(Morpholin-4-yl)ethyl]amino}-2-(naphthalen-1-yl)-1,3-oxazole-4-carbonitrile chemical structure, C20H20N4O2, CAS 844458-38-4](/s/KWBKEIGMVBUGGD-UHFFFAOYSA-N.svg)
5-{[2-(Morpholin-4-yl)ethyl]amino}-2-(naphthalen-1-yl)-1,3-oxazole-4-carbonitrile
CAS 844458-38-4C20H20N4O2
Gpi-15427
CAS 805242-85-7C20H20N4O2
![4-Ethyl-6-[3-methyl-4-(1-methyl-1H-benzimidazol-2-yl)-1H-pyrazol-5-yl]benzene-1,3-diol chemical structure, C20H20N4O2, CAS 307526-36-9](/s/APQCBAKMOBMKMP-UHFFFAOYSA-N.svg)
4-Ethyl-6-[3-methyl-4-(1-methyl-1H-benzimidazol-2-yl)-1H-pyrazol-5-yl]benzene-1,3-diol
CAS 307526-36-9C20H20N4O2
![N-[6-Methyl-1-(2-methylpropyl)-3-pyrazolo[3,4-b]quinolinyl]-2-furancarboxamide chemical structure, C20H20N4O2, CAS 714286-78-9](/s/WMVQZIABIMIQEH-UHFFFAOYSA-N.svg)
N-[6-Methyl-1-(2-methylpropyl)-3-pyrazolo[3,4-b]quinolinyl]-2-furancarboxamide
CAS 714286-78-9C20H20N4O2
![6'-Amino-4'-ethyl-5'-(4-hydroxyphenyl)-N-methyl-[3,3'-bipyridine]-6-carboxamide chemical structure, C20H20N4O2, CAS 2009273-71-4](/s/UCYSSYGGXOFJKK-UHFFFAOYSA-N.svg)
6'-Amino-4'-ethyl-5'-(4-hydroxyphenyl)-N-methyl-[3,3'-bipyridine]-6-carboxamide
CAS 2009273-71-4C20H20N4O2
![N-(4-Isopropylphenyl)-2-oxo-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-4-carboxamide chemical structure, C20H20N4O2, CAS 1008014-84-3](/s/YVZUNBSKZMEMME-UHFFFAOYSA-N.svg)
N-(4-Isopropylphenyl)-2-oxo-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-4-carboxamide
CAS 1008014-84-3C20H20N4O2
![3-[1-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-2,5-dimethyl-1H-pyrrol-3-yl]-3-oxo-propionitrile chemical structure, C20H20N4O2, CAS 565193-58-0](/s/GIQOWYANJGWYJP-UHFFFAOYSA-N.svg)
3-[1-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-2,5-dimethyl-1H-pyrrol-3-yl]-3-oxo-propionitrile
CAS 565193-58-0C20H20N4O2
2-Benzamido-N-(3-imidazol-1-ylpropyl)benzamide
CAS 380646-67-3C20H20N4O2
![3-(1H-Benzimidazol-1-yl)-N'-[(1E,2E)-3-(2-methoxyphenyl)prop-2-en-1-ylidene]propanehydrazide chemical structure, C20H20N4O2, CAS 401609-89-0](/s/AQVHFSPFCZCWCN-NTYCFHCOSA-N.svg)
3-(1H-Benzimidazol-1-yl)-N'-[(1E,2E)-3-(2-methoxyphenyl)prop-2-en-1-ylidene]propanehydrazide
CAS 401609-89-0C20H20N4O2
![3-[5-Amino-3-methyl-1-(4-methylphenyl)-1H-pyrazol-4-yl]-1,3-dihydro-3-hydroxy-1-methyl-2H-indol-2-one chemical structure, C20H20N4O2, CAS 475653-99-7](/s/GJMMLBPASVWOKL-UHFFFAOYSA-N.svg)
3-[5-Amino-3-methyl-1-(4-methylphenyl)-1H-pyrazol-4-yl]-1,3-dihydro-3-hydroxy-1-methyl-2H-indol-2-one
CAS 475653-99-7C20H20N4O2
1-(4,6-Dimethylpyrimidin-2-yl)-6-(4-methoxyphenyl)-1,5,6,7-tetrahydro-4H-indazol-4-one
CAS 876721-82-3C20H20N4O2
![9-Methyl-4-oxo-2-(4-phenylpiperazin-1-yl)-4H-pyrido[1,2-a]pyrimidine-3-carbaldehyde chemical structure, C20H20N4O2, CAS 839686-42-9](/s/PLTJDNHSYMFJHH-UHFFFAOYSA-N.svg)
9-Methyl-4-oxo-2-(4-phenylpiperazin-1-yl)-4H-pyrido[1,2-a]pyrimidine-3-carbaldehyde
CAS 839686-42-9C20H20N4O2
![3-[2-Oxo-2-(4-phenylpiperazin-1-yl)ethyl]quinazolin-4-one chemical structure, C20H20N4O2, CAS 362494-42-6](/s/AOYOJRPTFNGWOE-UHFFFAOYSA-N.svg)
3-[2-Oxo-2-(4-phenylpiperazin-1-yl)ethyl]quinazolin-4-one
CAS 362494-42-6C20H20N4O2
1-Methyl-N~3~,N~5~-bis(4-methylphenyl)-1H-pyrazole-3,5-dicarboxamide
CAS 311812-92-7C20H20N4O2
![N-[(3,5-Dimethoxyphenyl)methyl]-8-methyl-5H-pyrimido[5,4-b]indol-4-amine chemical structure, C20H20N4O2, CAS 844449-75-8](/s/XTFJVIKRBYAAQP-UHFFFAOYSA-N.svg)
N-[(3,5-Dimethoxyphenyl)methyl]-8-methyl-5H-pyrimido[5,4-b]indol-4-amine
CAS 844449-75-8C20H20N4O2
![7-Methyl-4-oxo-2-(4-phenylpiperazin-1-yl)-4H-pyrido[1,2-a]pyrimidine-3-carbaldehyde chemical structure, C20H20N4O2, CAS 839680-02-3](/s/YTWBZFMOWAOPON-UHFFFAOYSA-N.svg)
7-Methyl-4-oxo-2-(4-phenylpiperazin-1-yl)-4H-pyrido[1,2-a]pyrimidine-3-carbaldehyde
CAS 839680-02-3C20H20N4O2
![[4-[(4-Methylphthalazin-1-yl)amino]phenyl]-morpholin-4-ylmethanone chemical structure, C20H20N4O2, CAS 373376-82-0](/s/WBBONTQMDJNYKA-UHFFFAOYSA-N.svg)
[4-[(4-Methylphthalazin-1-yl)amino]phenyl]-morpholin-4-ylmethanone
CAS 373376-82-0C20H20N4O2
![2-[4-(1,3-Benzodioxol-5-ylmethyl)piperazino]quinoxaline chemical structure, C20H20N4O2, CAS 241146-76-9](/s/AQFDARNWBSOCPZ-UHFFFAOYSA-N.svg)
2-[4-(1,3-Benzodioxol-5-ylmethyl)piperazino]quinoxaline
CAS 241146-76-9C20H20N4O2
![(4-Methylpiperazin-1-yl)-[2-(3-phenyl-1,2,4-oxadiazol-5-yl)phenyl]methanone chemical structure, C20H20N4O2, CAS 862199-83-5](/s/PZXZYNBIZMZIOU-UHFFFAOYSA-N.svg)
(4-Methylpiperazin-1-yl)-[2-(3-phenyl-1,2,4-oxadiazol-5-yl)phenyl]methanone
CAS 862199-83-5C20H20N4O2
![1-[4-[4-(1H-Indazole-3-carbonyl)piperazin-1-yl]phenyl]ethanone chemical structure, C20H20N4O2, CAS 851899-68-8](/s/QMHGLGYCFYZITI-UHFFFAOYSA-N.svg)
1-[4-[4-(1H-Indazole-3-carbonyl)piperazin-1-yl]phenyl]ethanone
CAS 851899-68-8C20H20N4O2
![3-Acetamido-N-[1-(4-imidazol-1-ylphenyl)ethyl]benzamide chemical structure, C20H20N4O2, CAS 847770-24-5](/s/NMYADGMFLHDXLH-UHFFFAOYSA-N.svg)
3-Acetamido-N-[1-(4-imidazol-1-ylphenyl)ethyl]benzamide
CAS 847770-24-5C20H20N4O2
![N-[3-(6-Piperidin-1-ylpyridazin-3-yl)phenyl]furan-2-carboxamide chemical structure, C20H20N4O2, CAS 899980-73-5](/s/CFPPQBNOZSYZJV-UHFFFAOYSA-N.svg)
N-[3-(6-Piperidin-1-ylpyridazin-3-yl)phenyl]furan-2-carboxamide
CAS 899980-73-5C20H20N4O2
N-(4-(6-(Piperidin-1-yl)pyridazin-3-yl)phenyl)furan-2-carboxamide
CAS 899954-06-4C20H20N4O2
![4-[[3-(Piperazine-1-carbonyl)phenyl]methyl]-2H-phthalazin-1-one chemical structure, C20H20N4O2, CAS 763111-46-2](/s/DDQGJTMUAYKRHB-UHFFFAOYSA-N.svg)
4-[[3-(Piperazine-1-carbonyl)phenyl]methyl]-2H-phthalazin-1-one
CAS 763111-46-2C20H20N4O2
- 1-Methyl-N~3~,N~5~-bis(2-methylphenyl)-1H-pyrazole-3,5-dicarboxamide356564-68-6C20H20N4O2
- 7-(3,4-Dimethoxyphenyl)-5-(4-methylphenyl)-4,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidine459418-18-9C20H20N4O2
- 4,4'-Di(methacryloylamino)azobenzene76961-11-0C20H20N4O2
- N'-(3-Allyl-2-hydroxybenzylidene)-2-(2-ME-1H-benzimidazol-1-yl)acetohydrazide303094-93-1C20H20N4O2
- N-[(E)-(2,4-Dimethoxyphenyl)methylideneamino]-4-methyl-6-phenylpyrimidin-2-amine330981-16-3C20H20N4O2
- N-[(E)-(1-Benzyl-3,5-dimethylpyrazol-4-yl)methylideneamino]-2-hydroxybenzamide850801-33-1C20H20N4O2
- 1-(3,5-Dimethylphenyl)-5-(4-ethylphenyl)-1,6a-dihydropyrrolo[3,4-d][1,2,3]triazole-4,6(3aH,5H)-dione1172904-22-1C20H20N4O2
- 1-(3,4-Dimethylphenyl)-5-(3,5-dimethylphenyl)-1,6a-dihydropyrrolo[3,4-d][1,2,3]triazole-4,6(3aH,5H)-dione1173043-40-7C20H20N4O2
- 2-[4-(Azepan-1-yl)-3-nitrophenyl]quinoxaline353466-88-3C20H20N4O2
- 3-Methyl-1-oxo-2-(3-oxo-3-pyrrolidin-1-ylpropyl)-5H-pyrido[1,2-a]benzimidazole-4-carbonitrile929820-25-7C20H20N4O2
- 2-(4-Methoxyphenyl)-N-(4-((6-methylpyridazin-3-yl)amino)phenyl)acetamide1203341-26-7C20H20N4O2
- N-Cyclopentyl-4-[(4-oxo-1,2,3-benzotriazin-3-yl)methyl]benzamide440330-38-1C20H20N4O2
- 1-(2-Ethylphenyl)-3-(4-((6-methylpyridazin-3-yl)oxy)phenyl)urea1207021-13-3C20H20N4O2
- N-(4-Methylpyridin-2-yl)-4-(6-oxo-4-phenylpyrimidin-1(6H)-yl)butanamide1257548-72-3C20H20N4O2
- N-{1-[3-(Pyridin-4-yl)-1,2,4-oxadiazol-5-yl]cyclohexyl}benzamide1340825-00-4C20H20N4O2
- 2-[3-(3,5-Dimethylpyrazol-1-yl)-4-nitrophenyl]-3,4-dihydro-1H-isoquinoline430448-39-8C20H20N4O2
- 4-{5-[3-(Dimethylamino)phenyl]-1,2,4-oxadiazol-3-yl}-1-phenylpyrrolidin-2-one1170795-01-3C20H20N4O2
- 1-(4-(3,5-Dimethylphenyl)-3-oxo-3,4-dihydropyrazin-2-yl)-3-(m-tolyl)urea1206986-45-9C20H20N4O2
- 5-(4-Ethylphenyl)-1-(2-methylbenzyl)-3a,6a-dihydropyrrolo[3,4-d][1,2,3]triazole-4,6(1H,5H)-dione1008273-63-9C20H20N4O2
- (4-(4-Methoxyphenyl)piperazin-1-yl)(quinoxalin-6-yl)methanone889306-80-3C20H20N4O2
- 2-Methyl-N-(3-methylpyridin-2-yl)-2-(6-oxo-3-phenylpyridazin-1(6H)-yl)propanamide1203128-01-1C20H20N4O2
- 4-(6-Oxo-3-(p-tolyl)pyridazin-1(6H)-yl)-N-(pyridin-2-yl)butanamide1226445-07-3C20H20N4O2
- N-[1-(3,5-Dimethylphenyl)-2-oxopyrrolidin-3-yl]-1H-1,3-benzodiazole-5-carboxamide1775293-10-1C20H20N4O2
- 8-(4-Benzylpiperazin-1-yl)-5-nitroquinoline840456-68-0C20H20N4O2
- (E)-2-(1H-Benzo[d]imidazol-2-yl)-3-(5-(2,6-dimethylmorpholino)furan-2-yl)acrylonitrile477535-49-2C20H20N4O2
- 1-Benzyl-3-[3-(6-ethoxypyridazin-3-yl)phenyl]urea1021111-94-3C20H20N4O2
- N-(2,3-Dihydro-1H-inden-2-yl)-4-(4-oxo-1,2,3-benzotriazin-3(4H)-yl)butanamide1144449-49-9C20H20N4O2
- 2-(3-Methoxyphenyl)-1-(3-methoxypropyl)-1H-imidazo[4,5-b]quinoxaline844835-23-0C20H20N4O2
- 1-[6-(Furan-2-yl)pyridazin-3-yl]-N-phenylpiperidine-4-carboxamide1105219-82-6C20H20N4O2
- (4-Methyl-1-piperazinyl)[6-(2-pyridinyloxy)-2-quinolinyl]methanone1802849-19-9C20H20N4O2
- (4-(Hydroxydiphenylmethyl)-2H-1,2,3-triazol-2-yl)(pyrrolidin-1-yl)methanone1312782-43-6C20H20N4O2
- 2-(4-((4-Nitrophenyl)methyl)-1-piperazinyl)quinoline684646-73-9C20H20N4O2
- 2-(1H-Indazol-3-yl)-N-(2-methoxyethyl)-N-methyl-1H-indole-6-carboxamide1294514-69-4C20H20N4O2
- 2-Methyl-4-[(4-phenylpiperazin-1-yl)carbonyl]phthalazin-1(2H)-one696657-48-4C20H20N4O2
- 5-Amino-4-(1H-1,3-benzodiazol-2-yl)-1-[2-(4-methoxyphenyl)ethyl]-2,3-dihydro-1H-pyrrol-3-one881567-40-4C20H20N4O2
- Methanimidamide, N',N'''-(9,10-dihydro-9,10-dioxo-2,6-anthracenediyl)bis(N,N-dimethyl-61907-13-9C20H20N4O2
- 5-(3,4-Dimethoxyphenyl)-7-(4-methylphenyl)-4,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidine459418-25-8C20H20N4O2
- Isopropyl 2-methyl-4-(3-pyridyl)-1,4-dihydropyrimido[1,2-a][1,3]benzimidazole-3-carboxylate879045-91-7C20H20N4O2
- Isopropyl 2-methyl-4-(4-pyridyl)-1,4-dihydropyrimido[1,2-a][1,3]benzimidazole-3-carboxylate879045-97-3C20H20N4O2
- (E)-N'-(4-Ethoxybenzylidene)-4-methyl-3-phenyl-1H-pyrazole-5-carbohydrazide1285536-84-6C20H20N4O2
- 3-(4-Ethoxyphenyl)-N'-[(1E)-1-phenylethylidene]-1H-pyrazole-5-carbohydrazide5786-16-3C20H20N4O2
- 2-(4-Benzylpiperazin-1-yl)-4-oxo-4H-pyrido[1,2-a]pyrimidine-3-carbaldehyde462069-53-0C20H20N4O2
- N-[3-(Cyclopropanecarbonylamino)-4-phenyldiazenylphenyl]cyclopropanecarboxamide548450-35-7C20H20N4O2
- N'-[(1E)-1-(4-Methoxyphenyl)ethylidene]-4-methyl-3-phenyl-1H-pyrazole-5-carbohydrazide1284267-38-4C20H20N4O2
- (E)-3-(4-Ethylphenyl)-N'-(4-methoxybenzylidene)-1H-pyrazole-5-carbohydrazide1285578-41-7C20H20N4O2
- 7-(3,4-Dimethoxyphenyl)-2-methyl-5-phenyl-4,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidine925025-18-9C20H20N4O2
- 1,2,4-Triazin-3-amine, 5,6-bis(4-methoxyphenyl)-N-2-propenyl-99306-38-4C20H20N4O2
- (Z)-3-(1H-Benzo[d]imidazol-1-yl)-N'-((E)-3-(2-methoxyphenyl)allylidene)propanehydrazideC20H20N4O2
- (E)-3-(3-Ethoxyphenyl)-N'-(4-methylbenzylidene)-1H-pyrazole-5-carbohydrazide1284273-94-4C20H20N4O2
- 1-[4-(Propan-2-yl)phenyl]-4-[3-(pyridin-2-yl)-1,2,4-oxadiazol-5-yl]pyrrolidin-2-one941961-49-5C20H20N4O2
- 5-Cyclopropyl-N-(2-methoxyphenyl)-1-(4-methylphenyl)-1H-1,2,3-triazole-4-carboxamide954768-13-9C20H20N4O2
- N-(3-Acetylphenyl)-1-phenyl-5-(propan-2-yl)-1H-1,2,3-triazole-4-carboxamide954812-21-6C20H20N4O2
- 3-[4-(2-Morpholin-4-ylethoxy)phenyl]-1H-indazole-5-carbonitrile395103-65-8C20H20N4O2
- 4-Ethoxy-N-(4-((6-methylpyridazin-3-yl)amino)phenyl)benzamide1172250-18-8C20H20N4O2
- 1-Methyl-4-{[4-(2-pyridyl)piperazino]carbonyl}-2(1H)-quinolinone1374532-16-7C20H20N4O2
- N'-{[3-(4-Methoxyphenyl)-1H-pyrazol-4-yl]methylene}-3-phenylpropanohydrazide1006514-37-9C20H20N4O2
- 2-(4-Methoxyphenyl)-N'-{[3-(4-methylphenyl)-1H-pyrazol-4-yl]methylene}acetohydrazide515178-06-0C20H20N4O2
- 2,4-Diamino-N,1-dibenzyl-6-oxopyridine-3-carboxamide81975-60-2C20H20N4O2
- N,N-Dimethyl-5-[(4-methylbenzoyl)amino]-1-phenylpyrazole-4-carboxamide397853-23-5C20H20N4O2
- N-[(E)-(2-{2-[2-(Prop-2-en-1-yl)phenoxy]ethoxy}phenyl)methylidene]-4H-1,2,4-triazol-4-amine355815-35-9C20H20N4O2
- N-(3-(2-Methyl-4-oxopyrido[2,3-d]pyrimidin-3(4H)-yl)phenyl)cyclopentanecarboxamide921564-52-5C20H20N4O2
- 5-Cyclopropyl-N-(4-methoxyphenyl)-1-(p-tolyl)-1H-1,2,3-triazole-4-carboxamide954762-56-2C20H20N4O2
- N-(4-Acetylphenyl)-1-phenyl-5-(propan-2-yl)-1H-1,2,3-triazole-4-carboxamide954319-31-4C20H20N4O2
- 1-(4-Ethylbenzyl)-5-(4-methylphenyl)-3a,6a-dihydropyrrolo[3,4-d][1,2,3]triazole-4,6(1H,5H)-dione1008379-76-7C20H20N4O2
- 5-(3,4-Dimethylphenyl)-1-(4-methylbenzyl)-1,6a-dihydropyrrolo[3,4-d][1,2,3]triazole-4,6(3aH,5H)-dione1008977-04-5C20H20N4O2
- 3-[4-(3,4-Dihydro-2(1H)-isoquinolinyl)-4-oxobutyl]-1,2,3-benzotriazin-4(3H)-one440331-31-7C20H20N4O2
- 1-(2,3-Dimethylphenyl)-3-(3-((6-methylpyridazin-3-yl)oxy)phenyl)urea1207003-04-0C20H20N4O2
- 1-Methyl-1-(4-((6-methylpyridazin-3-yl)oxy)phenyl)-3-(m-tolyl)urea1207047-45-7C20H20N4O2
- 2-Methyl-N-(6-methylpyridin-2-yl)-2-(6-oxo-3-phenylpyridazin-1(6H)-yl)propanamide1203185-06-1C20H20N4O2
- N-((3-Cyclopentyl-4-oxo-3,4-dihydrophthalazin-1-yl)methyl)nicotinamide1421517-50-1C20H20N4O2
- 3-(3-Benzyl-1,2,4-oxadiazol-5-yl)-N-(p-tolyl)azetidine-1-carboxamide1351608-11-1C20H20N4O2
- 3-Cyano-N-((1-isonicotinoylpiperidin-4-yl)methyl)benzamide1396810-11-9C20H20N4O2
- N-(2-(4-Methyl-6-oxopyrimidin-1(6H)-yl)ethyl)-2-(phenylamino)benzamide1421477-94-2C20H20N4O2
- 2-[2-Oxo-2-(4-phenylpiperazino)ethyl]-1(2H)-phthalazinone817187-98-7C20H20N4O2
- 4-(5-Phenyl-1H-1,2,3-triazol-1-yl)-N-(tetrahydrofuran-2-ylmethyl)benzamide924829-64-1C20H20N4O2
- N-(4-Methoxyphenyl)-1-(pyridin-3-yl)-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxamide899961-26-3C20H20N4O2
Frequently asked questions
What is the molar mass of C20H20N4O2?
The molar mass of C20H20N4O2 is 348.41 g/mol, calculated from standard atomic weights for 20 carbon atoms, 20 hydrogen atoms, 4 nitrogen atoms and 2 oxygen atoms. The monoisotopic mass is 348.1586 Da.
How many compounds have the formula C20H20N4O2?
CompoundList lists 336 compounds with the molecular formula C20H20N4O2, including 5-{[2-(Morpholin-4-yl)ethyl]amino}-2-(naphthalen-1-yl)-1,3-oxazole-4-carbonitrile, Gpi-15427, 4-Ethyl-6-[3-methyl-4-(1-methyl-1H-benzimidazol-2-yl)-1H-pyrazol-5-yl]benzene-1,3-diol. 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 C20H20N4O2?
C20H20N4O2 has a degree of unsaturation of 13. 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.