Molecular formula
C18H21N5O
166 compounds have this formula on CompoundList.
- Molar mass
- 323.40g/mol
- Monoisotopic mass
- 323.1746Da
- Atoms
- 45
- Elements
- 4
- Rings plus double bonds
- 11
The formula C18H21N5O describes a molecule made of 18 carbon atoms, 21 hydrogen atoms, 5 nitrogen atoms and 1 oxygen 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 × 1866.85%12.011 × 18 = 216.198 g/mol
- H Hydrogen × 216.55%1.008 × 21 = 21.168 g/mol
- N Nitrogen × 521.66%14.007 × 5 = 70.035 g/mol
- O Oxygen × 14.95%15.999 × 1 = 15.999 g/mol
Look up another formula
Compounds with the formula C18H21N5O
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 166 compounds
![3-(3,5-Dimethyl-1H-pyrazol-4-yl)-N'-[(E)-(2-methyl-1H-indol-3-yl)methylidene]propanehydrazide chemical structure, C18H21N5O, CAS 306302-58-9](/s/HBQVINQUWDRMAP-VXLYETTFSA-N.svg)
3-(3,5-Dimethyl-1H-pyrazol-4-yl)-N'-[(E)-(2-methyl-1H-indol-3-yl)methylidene]propanehydrazide
CAS 306302-58-9C18H21N5O
2-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-(4-ethoxyphenyl)-6-methylpyrimidin-4-amine
CAS 312310-46-6C18H21N5O
![1-(2,4-Dimethylphenyl)-N-(oxolan-2-ylmethyl)pyrazolo[3,4-d]pyrimidin-4-amine chemical structure, C18H21N5O, CAS 393784-57-1](/s/ASPVMPXVYBMADK-UHFFFAOYSA-N.svg)
1-(2,4-Dimethylphenyl)-N-(oxolan-2-ylmethyl)pyrazolo[3,4-d]pyrimidin-4-amine
CAS 393784-57-1C18H21N5O
2-(Azepan-1-yl)-7-benzyl-3H-purin-6-one
CAS 179816-12-7C18H21N5O
![2-{[4-(Propan-2-yl)benzyl]amino}-3,5,6,7-tetrahydro-8H-cyclopenta[d][1,2,4]triazolo[1,5-a]pyrimidin-8-one chemical structure, C18H21N5O, CAS 876715-55-8](/s/WLHDEGQCMDHBMN-UHFFFAOYSA-N.svg)
2-{[4-(Propan-2-yl)benzyl]amino}-3,5,6,7-tetrahydro-8H-cyclopenta[d][1,2,4]triazolo[1,5-a]pyrimidin-8-one
CAS 876715-55-8C18H21N5O
![3-tert-Butyl-N'-[(E)-(2-methyl-1H-indol-3-yl)methylidene]-1H-pyrazole-5-carbohydrazide chemical structure, C18H21N5O, CAS 1285532-84-4](/s/FELKRIVGYPOGKE-VXLYETTFSA-N.svg)
3-tert-Butyl-N'-[(E)-(2-methyl-1H-indol-3-yl)methylidene]-1H-pyrazole-5-carbohydrazide
CAS 1285532-84-4C18H21N5O
2-Anilino-6-cyclohexylmethoxypurine
CAS 444722-80-9C18H21N5O
![N-[(4-Methylphenyl)methyl]-1-(oxan-2-yl)pyrazolo[3,4-d]pyrimidin-4-amine chemical structure, C18H21N5O, CAS 93996-46-4](/s/SHTJPRKZNARFGV-UHFFFAOYSA-N.svg)
N-[(4-Methylphenyl)methyl]-1-(oxan-2-yl)pyrazolo[3,4-d]pyrimidin-4-amine
CAS 93996-46-4C18H21N5O
![6-Amino-4-[4-(diethylamino)phenyl]-3-methyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile chemical structure, C18H21N5O, CAS 89607-45-4](/s/YUPNUPLNXFYXAO-UHFFFAOYSA-N.svg)
6-Amino-4-[4-(diethylamino)phenyl]-3-methyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile
CAS 89607-45-4C18H21N5O
![Cyclohexyl[1-(4-methoxyphenyl)pyrazolo[4,5-e]pyrimidin-4-yl]amine chemical structure, C18H21N5O, CAS 393784-42-4](/s/OHDWKUYULFOHDK-UHFFFAOYSA-N.svg)
Cyclohexyl[1-(4-methoxyphenyl)pyrazolo[4,5-e]pyrimidin-4-yl]amine
CAS 393784-42-4C18H21N5O
![2-Amino-N-cyclohexyl-1-methyl-1H-pyrrolo[2,3-b]quinoxaline-3-carboxamide chemical structure, C18H21N5O, CAS 881474-10-8](/s/RJNFUHKYCLAQKO-UHFFFAOYSA-N.svg)
2-Amino-N-cyclohexyl-1-methyl-1H-pyrrolo[2,3-b]quinoxaline-3-carboxamide
CAS 881474-10-8C18H21N5O
N11-Cyclopropyl-N5-((N,N-dimethylamino)ethyl)-5,11-dihydro-6H-dipyrido(3,2-b:2',3'-e)(1,4)diazepin-6-one
CAS 133627-35-7C18H21N5O
![N-(1-(Dimethylamino)propan-2-yl)-2-(pyridin-4-yl)-1H-benzo[d]imidazole-7-carboxamide chemical structure, C18H21N5O, CAS 2438721-44-7](/s/HCAALGAOSBFHFP-UHFFFAOYSA-N.svg)
N-(1-(Dimethylamino)propan-2-yl)-2-(pyridin-4-yl)-1H-benzo[d]imidazole-7-carboxamide
CAS 2438721-44-7C18H21N5O
![N-[2-(5,6-Dimethyl-2-phenyl-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-ethyl]-acetamide chemical structure, C18H21N5O, CAS 246855-42-5](/s/RHBHHAJRAODTML-UHFFFAOYSA-N.svg)
N-[2-(5,6-Dimethyl-2-phenyl-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-ethyl]-acetamide
CAS 246855-42-5C18H21N5O
![5,9-Diamino-N-[2-(dimethylamino)ethyl]acridine-4-carboxamide chemical structure, C18H21N5O, CAS 89459-50-7](/s/FQXXQHBOOLYFAC-UHFFFAOYSA-N.svg)
5,9-Diamino-N-[2-(dimethylamino)ethyl]acridine-4-carboxamide
CAS 89459-50-7C18H21N5O
![2,6-Dimethyl-4-[1-(3-methylphenyl)pyrazolo[3,4-d]pyrimidin-4-yl]morpholine chemical structure, C18H21N5O, CAS 393821-29-9](/s/BOVRQWUQMXMDLW-UHFFFAOYSA-N.svg)
2,6-Dimethyl-4-[1-(3-methylphenyl)pyrazolo[3,4-d]pyrimidin-4-yl]morpholine
CAS 393821-29-9C18H21N5O
![(5-Methyl-7-phenyl-4,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl)(piperidin-1-yl)methanone chemical structure, C18H21N5O, CAS 924856-90-6](/s/VUJDZDJISKXGRH-UHFFFAOYSA-N.svg)
(5-Methyl-7-phenyl-4,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl)(piperidin-1-yl)methanone
CAS 924856-90-6C18H21N5O
![[1-(3,5-Dimethylphenyl)pyrazolo[4,5-e]pyrimidin-4-yl](oxolan-2-ylmethyl)amine chemical structure, C18H21N5O, CAS 1105220-93-6](/s/XVWFVKNDOLNJSL-UHFFFAOYSA-N.svg)
[1-(3,5-Dimethylphenyl)pyrazolo[4,5-e]pyrimidin-4-yl](oxolan-2-ylmethyl)amine
CAS 1105220-93-6C18H21N5O
![7-Methyl-2-[4-(pyridin-2-yl)piperazin-1-yl]-7,8-dihydroquinazolin-5(6H)-one chemical structure, C18H21N5O, CAS 929813-85-4](/s/LADRNULRZZCNSX-UHFFFAOYSA-N.svg)
7-Methyl-2-[4-(pyridin-2-yl)piperazin-1-yl]-7,8-dihydroquinazolin-5(6H)-one
CAS 929813-85-4C18H21N5O
![2-Methyl-N-{3-[(1-phenyl-1H-tetrazol-5-yl)oxy]benzyl}propan-1-amine chemical structure, C18H21N5O, CAS 932214-77-2](/s/LJTFSTYLNMUOFE-UHFFFAOYSA-N.svg)
2-Methyl-N-{3-[(1-phenyl-1H-tetrazol-5-yl)oxy]benzyl}propan-1-amine
CAS 932214-77-2C18H21N5O
![2-[(4,6-Dimethylpyrimidin-2-yl)amino]-3-[4-(propan-2-yl)phenyl]-3,5-dihydro-4H-imidazol-4-one chemical structure, C18H21N5O, CAS 371958-16-6](/s/SCPISTYQPITQSS-UHFFFAOYSA-N.svg)
2-[(4,6-Dimethylpyrimidin-2-yl)amino]-3-[4-(propan-2-yl)phenyl]-3,5-dihydro-4H-imidazol-4-one
CAS 371958-16-6C18H21N5O
![4-Methyl-2-[4-(pyridin-2-yl)piperazin-1-yl]-7,8-dihydroquinazolin-5(6H)-one chemical structure, C18H21N5O, CAS 879625-63-5](/s/KSRBNBSBLOKDKM-UHFFFAOYSA-N.svg)
4-Methyl-2-[4-(pyridin-2-yl)piperazin-1-yl]-7,8-dihydroquinazolin-5(6H)-one
CAS 879625-63-5C18H21N5O
![2-Cyano-N'-[(E)-{1-[4-(dimethylamino)phenyl]-2,5-dimethyl-1H-pyrrol-3-yl}methylidene]acetohydrazide chemical structure, C18H21N5O, CAS 340304-40-7](/s/BRFBHXSYYPTGJS-UDWIEESQSA-N.svg)
2-Cyano-N'-[(E)-{1-[4-(dimethylamino)phenyl]-2,5-dimethyl-1H-pyrrol-3-yl}methylidene]acetohydrazide
CAS 340304-40-7C18H21N5O
![tert-Butyl{3-[(1-phenyl-1H-tetrazol-5-yl)oxy]benzyl}amine chemical structure, C18H21N5O, CAS 932005-94-2](/s/GBGKQBDIQFSQTI-UHFFFAOYSA-N.svg)
tert-Butyl{3-[(1-phenyl-1H-tetrazol-5-yl)oxy]benzyl}amine
CAS 932005-94-2C18H21N5O
- (4-(2-(1H-Imidazol-1-yl)ethyl)piperazin-1-yl)(1H-indol-2-yl)methanone123215-99-6C18H21N5O
- Benzoic acid, p-((2-propylbenzimidazol-1-ylmethyl)amino)-, hydrazide36841-34-6C18H21N5O
- Benzoic acid, 4-(((2-(1-methylethyl)-1H-benzimidazol-1-yl)methyl)amino)-, hydrazide36841-35-7C18H21N5O
- 1-(N'-Propan-2-ylcarbamimidoyl)-2-(9H-xanthen-9-yl)guanidine7473-49-6C18H21N5O
- 1-Allyl-2-amino-N-(sec-butyl)-1H-pyrrolo[2,3-b]quinoxaline-3-carboxamide577999-60-1C18H21N5O
- 4-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-(2-ethoxybenzyl)pyrimidin-2-amine1251546-27-6C18H21N5O
- 4-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-(4-ethoxybenzyl)pyrimidin-2-amine1251693-15-8C18H21N5O
- 7-Morpholin-4-yl-4-piperidin-1-ylquinazoline-2-carbonitrile1334601-64-7C18H21N5O
- N-[2-(2-Methylpropyl)-1H-benzimidazol-6-yl]-1,4,5,6-tetrahydrocyclopenta[c]pyrazole-3-carboxamide1442076-88-1C18H21N5O
- 2-[(4,6-Dimethyl-2-pyrimidinyl)amino]-N-[2-(1H-indol-1-yl)ethyl]acetamide1630905-66-6C18H21N5O
- 4-Ethyl-2-[3-methyl-5-[[(1S)-1-phenylethyl]amino]pyrazol-1-yl]-1H-pyrimidin-6-one2963581-29-3C18H21N5O
- 1-Ethyl-N-{2-[(4-methylbenzyl)oxy]benzyl}-1H-tetraazol-5-amine884995-26-0C18H21N5O
- 1,3-Dimethyl-N-(3-methylpyridin-2-yl)-6-(propan-2-yl)-1H-pyrazolo[3,4-b]pyridine-4-carboxamide1324092-25-2C18H21N5O
- 2-{4-[2-(1H-Pyrazol-1-yl)ethyl]piperazine-1-carbonyl}-1H-indole1334374-00-3C18H21N5O
- 7-[2-(1-Cyclohexenyl)ethyl]-2,5-dimethylpyrido[3,4-e][1,2,4]triazolo[1,5-a]pyrimidin-6(7H)-one1374544-59-8C18H21N5O
- N-[2-(1H-Imidazol-4-yl)ethyl]-3-isopropyl-1-phenyl-1H-pyrazole-5-carboxamide1630857-50-9C18H21N5O
- N-((1H-Benzo[d]imidazol-2-yl)methyl)-N,2-dimethyl-4,5,6,7-tetrahydro-1H-benzo[d]imidazole-5-carboxamide2034577-04-1C18H21N5O
- 6-Methyl-5-phenyl-1-(piperidin-1-ylmethyl)pyrazolo[3,4-d]pyrimidin-4-one90399-92-1C18H21N5O
- N-[3,5-Dimethyl-1-(2-methylbenzyl)-1H-pyrazol-4-yl]-1-methyl-1H-pyrazole-5-carboxamide492457-70-2C18H21N5O
- N-[3,5-Dimethyl-1-(2-methylbenzyl)-1H-pyrazol-4-yl]-1-methyl-1H-pyrazole-3-carboxamide494216-94-3C18H21N5O
- 1-(2-Pyridin-2-yl-4-pyrrolidin-1-yl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidin-6-yl)ethanone7243-45-0C18H21N5O
- Imidazo[1,2-a]pyrazin-8-amine, N-[2-(4-morpholinyl)ethyl]-3-phenyl-787590-65-2C18H21N5O
- 1-(2-Methoxyethyl)-3-(pyridin-3-ylmethyl)-1,2,3,4-tetrahydro[1,3,5]triazino[1,2-a]benzimidazole925625-74-7C18H21N5O
- 7-(Furan-2-ylmethyl)-2-isobutyl-8,9-dimethyl-7H-pyrrolo[3,2-e][1,2,4]triazolo[1,5-c]pyrimidine921094-98-6C18H21N5O
- 1 suppliers1-(1-(4,6-Dimethylpyrimidin-2-yl)piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one909683-16-5C18H21N5O
- 4-(1H-Indol-3-yl)-N-[(1H-pyrazol-3-yl)methyl]piperidine-1-carboxamide1333683-20-7C18H21N5O
- (4-(2-(1H-Pyrazol-1-yl)ethyl)piperazin-1-yl)(1H-indol-5-yl)methanone1334375-59-5C18H21N5O
- 3-(4-(Aminomethyl)phenyl)-N-(tetrahydro-2H-pyran-4-yl)imidazo[1,2-b]pyridazin-6-amine1012345-30-0C18H21N5O
- 4-((2-Ethyl-5,7-dimethylpyrazolo[1,5-a]pyrimidin-3-yl)methyl)benzohydrazide1401728-88-8C18H21N5O
- N-(1H-Indol-6-yl)-6-(pyrimidin-2-ylamino)hexanamide1435982-37-8C18H21N5O
- N-(2-(4-Methylpiperazin-1-yl)pyrimidin-5-yl)cinnamamide1421587-68-9C18H21N5O
- 1-[4-(Prop-2-yn-1-yl)piperazin-1-yl]-2-{[2-(1H-pyrazol-1-yl)phenyl]amino}ethan-1-one1384652-29-2C18H21N5O
- N-{[2-(Dimethylamino)-6-methylpyrimidin-4-yl]methyl}-2-(1H-indol-3-yl)acetamide1798035-40-1C18H21N5O
- N-[1-(5-Methyl-1H-pyrazol-3-yl)piperidin-4-yl]indolizine-2-carboxamide2034201-41-5C18H21N5O
- N-(3-([1,2,4]Triazolo[1,5-a]pyrimidin-6-yl)propyl)-3-(o-tolyl)propanamide2034615-56-8C18H21N5O
- Pyridin-4-yl(4-(5,6,7,8-tetrahydrocinnolin-3-yl)piperazin-1-yl)methanone1903433-12-4C18H21N5O
- N-(1-Cyano-1-cyclopropylethyl)-2-[(5-methyl-1-phenyl-1H-pyrazol-4-yl)amino]acetamide1808436-64-7C18H21N5O
- 2-(1-Methyl-1H-pyrazol-4-yl)-4-(3-piperidinyl)-1H-indole-7-carboxamide1643574-52-0C18H21N5O
- 1,3,5-Trimethyl-N-[2-(4-phenyl-1H-pyrazol-1-yl)ethyl]-1H-pyrazole-4-carboxamide2034553-29-0C18H21N5O
- (1-Ethyl-1H-pyrazol-5-yl)(3-(2-methyl-1H-benzo[d]imidazol-1-yl)pyrrolidin-1-yl)methanone2034386-14-4C18H21N5O
- N-[3-Methyl-1-(1H-1,2,4-triazol-1-yl)butan-2-yl]-4-(1H-pyrrol-1-yl)benzamide2191266-21-2C18H21N5O
- 1-Methyl-N-{[6-(morpholin-4-yl)pyridin-3-yl]methyl}-1H-1,3-benzodiazol-2-amine2178771-42-9C18H21N5O
- 3-(4-{[(5,6-Dimethylpyrimidin-4-yl)oxy]methyl}piperidin-1-yl)pyridine-2-carbonitrile2320378-70-7C18H21N5O
- 6-(4-(((5,6-Dimethylpyrimidin-4-yl)oxy)methyl)piperidin-1-yl)picolinonitrile2309214-67-1C18H21N5O
- 6-(4-{[(5,6-Dimethylpyrimidin-4-yl)oxy]methyl}piperidin-1-yl)pyridine-3-carbonitrile2309710-08-3C18H21N5O
- 1 suppliers3-[1-(3,6-Dimethylpyrazin-2-yl)piperidin-4-yl]-1H-benzimidazol-2-one2249427-92-5C18H21N5O
- N-(1-Cyanocyclobutyl)-1-(5-cyanopyridin-2-yl)-N-methylpiperidine-4-carboxamide1258746-69-8C18H21N5O
- 2-Diethylamino-4-[3-(2-methyl-4-pyridinyl)-[1,2,4]oxadiazol-5-yl]-6-methyl-pyridine1122092-81-2C18H21N5O
- 5-(4-Aminophenyl)-2-(2-morpholinoethylamino)nicotinonitrile1267854-10-3C18H21N5O
- N-(1H-Indol-4-yl)-6-(pyrimidin-2-ylamino)hexanamide1436001-72-7C18H21N5O
- 4-((4,6-Dimethylpyrimidin-2-yl)amino)-N-(1H-indol-5-yl)butanamide1401540-58-6C18H21N5O
- 1-[3-Methyl-1-([1,2,4]triazolo[4,3-a]pyridin-3-yl)butyl]-3-phenylurea2108830-48-2C18H21N5O
- 1-{5H,6H,7H-Cyclopenta[c]pyridazin-3-yl}-N-(pyridin-4-yl)piperidine-3-carboxamide2097889-55-7C18H21N5O
- 2-[(1-{5H,6H,7H-Cyclopenta[d]pyrimidin-4-yl}azetidin-3-yl)methyl]-2H,3H,5H,6H,7H-cyclopenta[c]pyridazin-3-one2195938-92-0C18H21N5O
- Propanimidamide, N-(4-(dimethylamino)phenyl)-N'-hydroxy-2-((phenylmethylene)hydrazono)-126389-51-3C18H21N5O
- 2-{[1-(6-Ethylpyrimidin-4-yl)piperidin-4-yl]methoxy}pyridine-4-carbonitrile2415602-41-2C18H21N5O
- 2-{[1-({Imidazo[1,2-a]pyridin-2-yl}methyl)piperidin-4-yl]methoxy}pyrazine2549016-24-0C18H21N5O
- N-(3,4-Dimethylphenyl)-9-[(oxolan-2-yl)methyl]-9H-purin-6-amine2640949-24-0C18H21N5O
- (2-Methyl-4-pyrrolidin-1-yl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidin-6-yl)-pyridin-3-ylmethanone7243-26-7C18H21N5O
- N-[5-Cyano-2-(hexylamino)pyrimidin-4-yl]benzamide918662-97-2C18H21N5O
- 9-Benzyl-6-[2-(morpholin-4-yl)ethyl]-9H-purine920503-32-8C18H21N5O
- 2,6-Dimethyl-4-(1-(o-tolyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl)morpholine1005308-05-3C18H21N5O
- 5-((4-(1-Phenyl-1H-pyrazol-4-yl)pyrimidin-2-yl)amino)pentan-1-ol1227706-51-5C18H21N5O
- 1-(1-(5-Aminopyridin-2-yl)piperidin-4-yl)-3-methyl-1H-benzo[d]imidazol-2(3H)-one1227935-11-6C18H21N5O
- 3-{4-[2-(4-Methoxyphenyl)ethyl]piperazin-1-yl}pyrazine-2-carbonitrile918481-62-6C18H21N5O
- 1-[8-(2,4-Dimethylimidazol-1-ylmethyl)isoquinolin-3-yl]-3-ethylurea1338258-00-6C18H21N5O
- 4-(2-Amino[1,2,4]triazolo[1,5-a]pyridin-6-yl)-N-(2,2-dimethylpropyl)benzamide1309682-25-4C18H21N5O
- 3-(2-Amino[1,2,4]triazolo[1,5-a]pyridin-6-yl)-N-(2,2-dimethylpropyl)benzamide1309682-33-4C18H21N5O
- 2,9-Diamino-N-[2-(dimethylamino)ethyl]acridine-4-carboxamide89459-48-3C18H21N5O
- 6,9-Diamino-N-[2-(dimethylamino)ethyl]acridine-4-carboxamide89459-55-2C18H21N5O
- 7,9-Diamino-N-(2-(dimethylamino)ethyl)acridine-4-carboxamide89459-59-6C18H21N5O
- 6-Benzyl-1-(1-methylpiperidin-4-yl)-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one1189768-55-5C18H21N5O
- 4-[(1-{2-Methylpyrazolo[1,5-a]pyrazin-4-yl}piperidin-3-yl)methoxy]pyridine2380179-65-5C18H21N5O
- 2-{[1-(5,6-Dimethylpyrimidin-4-yl)piperidin-3-yl]methoxy}pyridine-4-carbonitrile2380168-64-7C18H21N5O
- 2-{[1-(4,6-Dimethylpyrimidin-2-yl)piperidin-3-yl]methoxy}pyridine-4-carbonitrile2380173-60-2C18H21N5O
- 2-Methyl-4-[(1-{pyrazolo[1,5-a]pyrazin-4-yl}piperidin-3-yl)methoxy]pyridine2380095-72-5C18H21N5O
Frequently asked questions
What is the molar mass of C18H21N5O?
The molar mass of C18H21N5O is 323.40 g/mol, calculated from standard atomic weights for 18 carbon atoms, 21 hydrogen atoms, 5 nitrogen atoms and 1 oxygen atom. The monoisotopic mass is 323.1746 Da.
How many compounds have the formula C18H21N5O?
CompoundList lists 166 compounds with the molecular formula C18H21N5O, including 3-(3,5-Dimethyl-1H-pyrazol-4-yl)-N'-[(E)-(2-methyl-1H-indol-3-yl)methylidene]propanehydrazide, 2-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-(4-ethoxyphenyl)-6-methylpyrimidin-4-amine, 1-(2,4-Dimethylphenyl)-N-(oxolan-2-ylmethyl)pyrazolo[3,4-d]pyrimidin-4-amine. 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 C18H21N5O?
C18H21N5O 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.