Molecular formula
C18H21N5O3
174 compounds have this formula on CompoundList.
- Molar mass
- 355.40g/mol
- Monoisotopic mass
- 355.1644Da
- Atoms
- 47
- Elements
- 4
- Rings plus double bonds
- 11
The formula C18H21N5O3 describes a molecule made of 18 carbon atoms, 21 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 × 1860.83%12.011 × 18 = 216.198 g/mol
- H Hydrogen × 215.96%1.008 × 21 = 21.168 g/mol
- N Nitrogen × 519.71%14.007 × 5 = 70.035 g/mol
- O Oxygen × 313.51%15.999 × 3 = 47.997 g/mol
Look up another formula
Compounds with the formula C18H21N5O3
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 101 to 174 of 174 compounds
![3-(2-(4-(2-(1H-Pyrazol-1-yl)ethyl)piperazin-1-yl)-2-oxoethyl)benzo[d]oxazol-2(3H)-one chemical structure, C18H21N5O3, CAS 1286727-98-7](/s/UYNQBDLWODQAQP-UHFFFAOYSA-N.svg)
3-(2-(4-(2-(1H-Pyrazol-1-yl)ethyl)piperazin-1-yl)-2-oxoethyl)benzo[d]oxazol-2(3H)-one
CAS 1286727-98-7C18H21N5O3
![3-(3,5-Dimethyl-1,2-oxazol-4-yl)-N-[5-(4-methoxybenzyl)-4H-1,2,4-triazol-3-yl]propanamide chemical structure, C18H21N5O3, CAS 1401535-41-8](/s/CCQHJVMWQKIYER-UHFFFAOYSA-N.svg)
3-(3,5-Dimethyl-1,2-oxazol-4-yl)-N-[5-(4-methoxybenzyl)-4H-1,2,4-triazol-3-yl]propanamide
CAS 1401535-41-8C18H21N5O3
![3-(2,5-Dioxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepin-3-yl)-N-(1-isopropyl-1H-pyrazol-5-yl)propanamide chemical structure, C18H21N5O3, CAS 1380576-01-1](/s/GYMVPYBAQAGKQO-UHFFFAOYSA-N.svg)
3-(2,5-Dioxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepin-3-yl)-N-(1-isopropyl-1H-pyrazol-5-yl)propanamide
CAS 1380576-01-1C18H21N5O3
![2-(3,5-Dimethyl-1,2-oxazol-4-yl)-N-[(1r,4r)-4-[(3-cyanopyrazin-2-yl)oxy]cyclohexyl]acetamide chemical structure, C18H21N5O3, CAS 2034398-75-7](/s/BPRPKMUIZVKDBE-UHFFFAOYSA-N.svg)
2-(3,5-Dimethyl-1,2-oxazol-4-yl)-N-[(1r,4r)-4-[(3-cyanopyrazin-2-yl)oxy]cyclohexyl]acetamide
CAS 2034398-75-7C18H21N5O3
(4-(Pyrimidin-2-yl)piperazin-1-yl)(2-((tetrahydrofuran-3-yl)oxy)pyridin-4-yl)methanone
CAS 1903339-02-5C18H21N5O3
![7-[3-Methyl-3-(4-methyl-piperazin-1-yl)-but-1-ynyl]-6-nitro-quinazolin-4-ol chemical structure, C18H21N5O3, CAS 948913-18-6](/s/IPZFXOMVAKKEAS-UHFFFAOYSA-N.svg)
7-[3-Methyl-3-(4-methyl-piperazin-1-yl)-but-1-ynyl]-6-nitro-quinazolin-4-ol
CAS 948913-18-6C18H21N5O3
![Benzoic acid, 4-[[(4-pyrazinyl-1-piperazinyl)carbonyl]amino]-, ethyl ester chemical structure, C18H21N5O3, CAS 89007-33-0](/s/DHFCIPOIXFDNRO-UHFFFAOYSA-N.svg)
Benzoic acid, 4-[[(4-pyrazinyl-1-piperazinyl)carbonyl]amino]-, ethyl ester
CAS 89007-33-0C18H21N5O3
![2-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-N-(3-methoxyphenyl)acetamide chemical structure, C18H21N5O3, CAS 863447-84-1](/s/DTAAFVPNMGVBCM-UHFFFAOYSA-N.svg)
2-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-N-(3-methoxyphenyl)acetamide
CAS 863447-84-1C18H21N5O3
![2-[1-(2,4-Dimethylphenyl)-4-oxopyrazolo[3,4-d]pyrimidin-5-yl]-N-(2-methoxyethyl)acetamide chemical structure, C18H21N5O3, CAS 895004-43-0](/s/RNLPGXFOYVAMBW-UHFFFAOYSA-N.svg)
2-[1-(2,4-Dimethylphenyl)-4-oxopyrazolo[3,4-d]pyrimidin-5-yl]-N-(2-methoxyethyl)acetamide
CAS 895004-43-0C18H21N5O3
9-(3-Methoxyphenyl)-8-oxo-2-(pentan-3-yl)-8,9-dihydro-7H-purine-6-carboxamide
CAS 899742-15-5C18H21N5O3
![[(1-Cyanocyclohexyl)carbamoyl]methyl 1-ethyl-1H-1,2,3-benzotriazole-5-carboxylate chemical structure, C18H21N5O3, CAS 1210961-49-1](/s/BDIBVTUVIKYNEJ-UHFFFAOYSA-N.svg)
[(1-Cyanocyclohexyl)carbamoyl]methyl 1-ethyl-1H-1,2,3-benzotriazole-5-carboxylate
CAS 1210961-49-1C18H21N5O3
![Methyl 2-({[4-(2-pyrimidinyl)-1-piperazinyl]acetyl}amino)benzoate chemical structure, C18H21N5O3, CAS 872349-30-9](/s/CFTHIVGSIZXSTJ-UHFFFAOYSA-N.svg)
Methyl 2-({[4-(2-pyrimidinyl)-1-piperazinyl]acetyl}amino)benzoate
CAS 872349-30-9C18H21N5O3
![N-Cyclopentyl-2-(3,4-dioxo-8-phenyl-3,4,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazin-2(6H)-yl)acetamide chemical structure, C18H21N5O3, CAS 942011-66-7](/s/VVJJXTAZQOGOBZ-UHFFFAOYSA-N.svg)
N-Cyclopentyl-2-(3,4-dioxo-8-phenyl-3,4,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazin-2(6H)-yl)acetamide
CAS 942011-66-7C18H21N5O3
![N-(2-Methoxyethyl)-2-(4-methyl-7-oxo-1-(o-tolyl)-1H-pyrazolo[3,4-d]pyridazin-6(7H)-yl)acetamide chemical structure, C18H21N5O3, CAS 941973-29-1](/s/QHUWXQFWNYEYLN-UHFFFAOYSA-N.svg)
N-(2-Methoxyethyl)-2-(4-methyl-7-oxo-1-(o-tolyl)-1H-pyrazolo[3,4-d]pyridazin-6(7H)-yl)acetamide
CAS 941973-29-1C18H21N5O3
![N-Cyclopentyl-8-(4-methoxyphenyl)-4-oxo-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazine-3-carboxamide chemical structure, C18H21N5O3, CAS 952873-40-4](/s/YGKMJUHVQWBYIJ-UHFFFAOYSA-N.svg)
N-Cyclopentyl-8-(4-methoxyphenyl)-4-oxo-4,6,7,8-tetrahydroimidazo[2,1-c][1,2,4]triazine-3-carboxamide
CAS 952873-40-4C18H21N5O3
![2-(2-Oxo-2-(piperidin-1-yl)ethyl)-8-phenyl-7,8-dihydroimidazo[2,1-c][1,2,4]triazine-3,4(2H,6H)-dione chemical structure, C18H21N5O3, CAS 942011-27-0](/s/GCAMRJXHISDYGX-UHFFFAOYSA-N.svg)
2-(2-Oxo-2-(piperidin-1-yl)ethyl)-8-phenyl-7,8-dihydroimidazo[2,1-c][1,2,4]triazine-3,4(2H,6H)-dione
CAS 942011-27-0C18H21N5O3
![N-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-4-ethoxybenzamide chemical structure, C18H21N5O3, CAS 899995-26-7](/s/DNEGSASRBJWRMN-UHFFFAOYSA-N.svg)
N-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-4-ethoxybenzamide
CAS 899995-26-7C18H21N5O3
![N-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-2-(o-tolyloxy)acetamide chemical structure, C18H21N5O3, CAS 899751-91-8](/s/SYVLBTZJRLBZHW-UHFFFAOYSA-N.svg)
N-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-2-(o-tolyloxy)acetamide
CAS 899751-91-8C18H21N5O3
![N-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-2-(m-tolyloxy)acetamide chemical structure, C18H21N5O3, CAS 899995-70-1](/s/RDEUSULURLCECC-UHFFFAOYSA-N.svg)
N-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-2-(m-tolyloxy)acetamide
CAS 899995-70-1C18H21N5O3
![N-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-2-(p-tolyloxy)acetamide chemical structure, C18H21N5O3, CAS 899945-55-2](/s/RQCIYEHEDIHYCI-UHFFFAOYSA-N.svg)
N-(1-(tert-Butyl)-4-oxo-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)-2-(p-tolyloxy)acetamide
CAS 899945-55-2C18H21N5O3
2-((4-((2-(Carbamoylamino)-5-methyl-4-oxo-2,5-cyclohexadien-1-ylidene)amino)phenyl)ethylamino)acetamide
CAS 66612-19-9C18H21N5O3
![1,3-Dimethyl-2,4-dioxo-7-propyl-N-(pyridin-3-ylmethyl)-2,3,4,7-tetrahydro-1H-pyrrolo[2,3-d]pyrimidine-6-carboxamide chemical structure, C18H21N5O3, CAS 1021059-53-9](/s/OERPZXAUPLEVGM-UHFFFAOYSA-N.svg)
1,3-Dimethyl-2,4-dioxo-7-propyl-N-(pyridin-3-ylmethyl)-2,3,4,7-tetrahydro-1H-pyrrolo[2,3-d]pyrimidine-6-carboxamide
CAS 1021059-53-9C18H21N5O3
![N-[(3-Methyl-1,2-oxazol-5-yl)methyl]-4-(2-oxo-3H-benzimidazol-1-yl)piperidine-1-carboxamide chemical structure, C18H21N5O3, CAS 2249267-18-1](/s/YWEBCCOXLIYNIG-UHFFFAOYSA-N.svg)
N-[(3-Methyl-1,2-oxazol-5-yl)methyl]-4-(2-oxo-3H-benzimidazol-1-yl)piperidine-1-carboxamide
CAS 2249267-18-1C18H21N5O3
![1-(Benzo[d][1,3]dioxol-5-yl)-3-((1-(pyrimidin-2-yl)piperidin-4-yl)methyl)urea chemical structure, C18H21N5O3, CAS 1234952-30-7](/s/NUCWPYZHYXVWHK-UHFFFAOYSA-N.svg)
1-(Benzo[d][1,3]dioxol-5-yl)-3-((1-(pyrimidin-2-yl)piperidin-4-yl)methyl)urea
CAS 1234952-30-7C18H21N5O3
- 3-(2H-1,3-Benzodioxol-5-yl)-1-{[1-(pyrazin-2-yl)piperidin-4-yl]methyl}urea1396814-28-0C18H21N5O3
- N-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)-4-(5-methylpyrimidin-4-yl)piperazine-1-carboxamide1428351-40-9C18H21N5O3
- N-(2-Carbamoylphenyl)-1-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)piperidine-3-carboxamide1396687-00-5C18H21N5O3
- N-(4-Carbamoylphenyl)-1-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)piperidine-4-carboxamide1421478-26-3C18H21N5O3
- 1-Methyl-N-{2-oxo-9-oxa-1-azatricyclo[10.4.0.0^{3,8}]hexadeca-3,5,7-trien-5-yl}-1H-1,2,3-triazole-4-carboxamide1448059-88-8C18H21N5O3
- N-((1-(3-Cyanopyridin-2-yl)piperidin-4-yl)methyl)-2-(2,5-dioxopyrrolidin-1-yl)acetamide1797725-01-9C18H21N5O3
- (5-Methylisoxazol-3-yl)(3-(4-(pyridin-2-yl)piperazine-1-carbonyl)azetidin-1-yl)methanone1705814-87-4C18H21N5O3
- 3-((1-(3-(3,5-Dimethylisoxazol-4-yl)propanoyl)piperidin-3-yl)oxy)pyrazine-2-carbonitrile2034449-00-6C18H21N5O3
- (4-(Pyrimidin-2-yl)piperazin-1-yl)(6-((tetrahydrofuran-3-yl)oxy)pyridin-3-yl)methanone2034491-15-9C18H21N5O3
- N-((4-Methoxy-6-morpholino-1,3,5-triazin-2-yl)methyl)cinnamamide2035017-94-6C18H21N5O3
- 4-Ethyl-2,3-dioxo-N-(2-(4-phenyl-1H-pyrazol-1-yl)ethyl)piperazine-1-carboxamide2034326-49-1C18H21N5O3
- Benzyl (2-(3-(4-cyclopropyl-1H-1,2,3-triazol-1-yl)azetidin-1-yl)-2-oxoethyl)carbamate2097902-22-0C18H21N5O3
- 3-(1H-Benzo[d]imidazol-2-yl)-N-((3-(tetrahydro-2H-pyran-4-yl)-1,2,4-oxadiazol-5-yl)methyl)propanamide2034291-68-2C18H21N5O3
- 3-(6-Methoxy-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)-N-(4-methoxyphenethyl)propanamide1324079-18-6C18H21N5O3
- 3-(6-Methoxy-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)-N-(2-methoxyphenethyl)propanamide1324075-75-3C18H21N5O3
- 3-[(2H-1,3-Benzodioxol-5-yl)methyl]-1-{[1-(pyrimidin-2-yl)pyrrolidin-2-yl]methyl}urea2097902-04-8C18H21N5O3
- 4-(3-Methyl-1,2,4-oxadiazol-5-yl)-N-[3-(2-oxoazetidin-1-yl)phenyl]piperidine-1-carboxamide2248934-20-3C18H21N5O3
- 1-(5-Methyl-1,2-oxazole-3-carbonyl)-4-[({2-methylimidazo[1,2-b]pyridazin-6-yl}oxy)methyl]piperidine2549038-71-1C18H21N5O3
- 7-Methoxy-3-({1-[(1,3,4-oxadiazol-2-yl)methyl]piperidin-4-yl}methyl)-3,4-dihydroquinazolin-4-one2549052-16-4C18H21N5O3
- 6-(3a-{[(5-Methylpyrimidin-2-yl)oxy]methyl}-octahydrocyclopenta[c]pyrrole-2-carbonyl)-3,4-dihydropyrimidin-4-one2549005-54-9C18H21N5O3
- 6-(3a-{[(5-Methylpyrimidin-2-yl)oxy]methyl}-octahydrocyclopenta[c]pyrrole-2-carbonyl)-2,3-dihydropyridazin-3-one2549013-51-4C18H21N5O3
- 3-Methyl-5-[[4-[[1-[(1-methylpyrazol-4-yl)methyl]aziridin-2-yl]methoxy]phenoxy]methyl]-1,2,4-oxadiazole2418669-43-7C18H21N5O3
- N-(2,4-Dimethoxyphenyl)-9-[(oxolan-2-yl)methyl]-9H-purin-6-amine2640957-82-8C18H21N5O3
- N-(3,5-Dimethoxyphenyl)-9-[(oxolan-2-yl)methyl]-9H-purin-6-amine2640967-88-8C18H21N5O3
- 1-(3-(2,4-Dioxotetrahydropyrimidin-1(2H)-yl)-1-methyl-1H-indazol-6-yl)piperidine-4-carbaldehyde2928528-21-4C18H21N5O3
- RefChem:1080146134341-20-1C18H21N5O3
- N-(5-Methylisoxazol-3-yl)-2-[4-(2-oxo-2,3-dihydro-1H-benzimidazol-1-yl)piperidin-1-yl]acetamide2434347-42-7C18H21N5O3
- 4-(3-Nitropyridin-2-yl)-N-(2-phenylethyl)piperazine-1-carboxamide839722-32-6C18H21N5O3
- N-(4-Carbamoylphenyl)-1-(6-methoxypyridazin-3-yl)piperidine-3-carboxamide1574328-05-4C18H21N5O3
- tert-Butyl 3-(4-cyano-3-methoxyphenyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazine-7(8H)-carboxylate1799842-84-4C18H21N5O3
- 1-[3-(2-Oxoazetidin-1-yl)phenyl]-3-{1-[(oxolan-2-yl)methyl]-1H-pyrazol-4-yl}urea2249344-63-4C18H21N5O3
- 2-{[1-(3-Methoxy-1-methyl-1H-pyrazole-4-carbonyl)piperidin-3-yl]methoxy}pyridine-4-carbonitrile2380097-71-0C18H21N5O3
- Ethyl 1-[2,3-dihydro-2-oxo-1-(piperidin-4-yl)-1H-benzo[d]imidazol-4-yl]pyrazol-4-carboxylate2375213-98-0C18H21N5O3
- 1-{1-[(5-Methyl-1,2,4-oxadiazol-3-yl)methyl]piperidin-4-yl}-3-phenylimidazolidine-2,4-dione2877664-47-4C18H21N5O3
- 1-(3-(2,6-Dioxopiperidin-3-yl)-1-methyl-1H-pyrazolo[3,4-b]pyridin-6-yl)piperidine-4-carbaldehyde2955886-63-0C18H21N5O3
- N-(3-Nitrophenyl)-2-[4-(pyridin-4-ylmethyl)piperazin-1-yl]acetamide3066620-93-4C18H21N5O3
- 3-[[2-(Azepan-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylideneamino]-1,3-oxazolidin-2-one33345-97-0C18H21N5O3
- 4H-Pyrido(1,2-a)pyrimidin-4-one, 2-(hexahydro-1H-azepin-1-yl)-3-(((2-oxo-3-oxazolidinyl)imino)methyl)-, hydrate36146-44-8C18H21N5O3
- L-Asparagine, N2-(2-aminoethyl)-N-[4-(2-phenyldiazenyl)phenyl]-1100356-93-1C18H21N5O3
- 1-(1-(1-Methyl-6-oxo-1,4,5,6-tetrahydropyridazine-3-carbonyl)piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one1326542-90-8C18H21N5O3
- 3-[4-(5-Azidopentyl)-1-oxo-isoindolin-2-yl]piperidine-2,6-dione2138441-36-6C18H21N5O3
- 5-(1-Methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)-N-phenyl-octahydropyrrolo[3,4-c]pyrrole-2-carboxamide2415562-40-0C18H21N5O3
- N-(3,4-Dimethoxyphenyl)-9-[(oxolan-2-yl)methyl]-9H-purin-6-amine2770615-98-8C18H21N5O3
- N-(2,5-Dimethoxyphenyl)-9-[(oxolan-2-yl)methyl]-9H-purin-6-amine2770631-96-2C18H21N5O3
- N-[(Furan-2-yl)methyl]-2-(4-{pyrazolo[1,5-a]pyrimidin-5-yloxy}piperidin-1-yl)acetamide2770634-93-8C18H21N5O3
- tert-Butyl N-[(3-hydroxy-6-methylpyridin-2-yl)methyl]-N-{[1,2,4]triazolo[4,3-a]pyridin-3-yl}carbamate2413896-51-0C18H21N5O3
- tert-Butyl N-(2-hydroxy-1-phenylethyl)-N-(7H-purin-6-yl)carbamate2680663-49-2C18H21N5O3
- N-(2H-1,3-Benzodioxol-5-yl)-2-{methyl[1-(5-methylpyrimidin-4-yl)azetidin-3-yl]amino}acetamide3054590-89-2C18H21N5O3
- N-(2H-1,3-Benzodioxol-5-yl)-2-{methyl[1-(6-methylpyrimidin-4-yl)azetidin-3-yl]amino}acetamide3054544-55-4C18H21N5O3
- 2'-Deoxy-8-(1,7-octadiyn-1-yl)adenosine1193451-47-6C18H21N5O3
Frequently asked questions
What is the molar mass of C18H21N5O3?
The molar mass of C18H21N5O3 is 355.40 g/mol, calculated from standard atomic weights for 18 carbon atoms, 21 hydrogen atoms, 5 nitrogen atoms and 3 oxygen atoms. The monoisotopic mass is 355.1644 Da.
How many compounds have the formula C18H21N5O3?
CompoundList lists 174 compounds with the molecular formula C18H21N5O3, including 3-(2-(4-(2-(1H-Pyrazol-1-yl)ethyl)piperazin-1-yl)-2-oxoethyl)benzo[d]oxazol-2(3H)-one, 3-(3,5-Dimethyl-1,2-oxazol-4-yl)-N-[5-(4-methoxybenzyl)-4H-1,2,4-triazol-3-yl]propanamide, 3-(2,5-Dioxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepin-3-yl)-N-(1-isopropyl-1H-pyrazol-5-yl)propanamide. 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 C18H21N5O3?
C18H21N5O3 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.