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 101 to 166 of 166 compounds
![1-Methyl-1-[1-(6-phenylpyridazin-3-yl)azetidin-3-yl]-3-(prop-2-en-1-yl)urea chemical structure, C18H21N5O, CAS 2380170-47-6](/s/LPJGDUCJAXSQFG-UHFFFAOYSA-N.svg)
1-Methyl-1-[1-(6-phenylpyridazin-3-yl)azetidin-3-yl]-3-(prop-2-en-1-yl)urea
CAS 2380170-47-6C18H21N5O
![1-Methyl-3-{3-[2-(propan-2-yl)-1H-1,3-benzodiazol-1-yl]azetidin-1-yl}-1,2-dihydropyrazin-2-one chemical structure, C18H21N5O, CAS 2415520-18-0](/s/JCTFNWDBJGRZST-UHFFFAOYSA-N.svg)
1-Methyl-3-{3-[2-(propan-2-yl)-1H-1,3-benzodiazol-1-yl]azetidin-1-yl}-1,2-dihydropyrazin-2-one
CAS 2415520-18-0C18H21N5O
![3-Methyl-6-{3-[2-(propan-2-yl)-1H-1,3-benzodiazol-1-yl]azetidin-1-yl}-3,4-dihydropyrimidin-4-one chemical structure, C18H21N5O, CAS 2415520-95-3](/s/ODZHDVVQCPUZGS-UHFFFAOYSA-N.svg)
3-Methyl-6-{3-[2-(propan-2-yl)-1H-1,3-benzodiazol-1-yl]azetidin-1-yl}-3,4-dihydropyrimidin-4-one
CAS 2415520-95-3C18H21N5O
![1-[1-(4-Methoxypyrimidin-2-yl)azetidin-3-yl]-2-(propan-2-yl)-1H-1,3-benzodiazole chemical structure, C18H21N5O, CAS 2415509-91-8](/s/LOCSCLGREJCLRI-UHFFFAOYSA-N.svg)
1-[1-(4-Methoxypyrimidin-2-yl)azetidin-3-yl]-2-(propan-2-yl)-1H-1,3-benzodiazole
CAS 2415509-91-8C18H21N5O
![N-{[2-(Pyrrolidin-1-yl)pyridin-4-yl]methyl}-5H,6H,7H-cyclopenta[c]pyridazine-3-carboxamide chemical structure, C18H21N5O, CAS 2415511-92-9](/s/YBSKSVOPBJHOGF-UHFFFAOYSA-N.svg)
N-{[2-(Pyrrolidin-1-yl)pyridin-4-yl]methyl}-5H,6H,7H-cyclopenta[c]pyridazine-3-carboxamide
CAS 2415511-92-9C18H21N5O
![2-[1-({5H,6H,7H-Pyrrolo[2,1-c][1,2,4]triazol-3-yl}methyl)piperidin-3-yl]-1,3-benzoxazole chemical structure, C18H21N5O, CAS 2324664-72-2](/s/XTHHWIVCZHYNCG-UHFFFAOYSA-N.svg)
2-[1-({5H,6H,7H-Pyrrolo[2,1-c][1,2,4]triazol-3-yl}methyl)piperidin-3-yl]-1,3-benzoxazole
CAS 2324664-72-2C18H21N5O
![N-(1-{Furo[3,2-c]pyridin-4-yl}piperidin-4-yl)-N,6-dimethylpyrimidin-4-amine chemical structure, C18H21N5O, CAS 2877680-61-8](/s/KKZRDUNMDXVKCT-UHFFFAOYSA-N.svg)
N-(1-{Furo[3,2-c]pyridin-4-yl}piperidin-4-yl)-N,6-dimethylpyrimidin-4-amine
CAS 2877680-61-8C18H21N5O
![6-Methyl-2-(4-{[(3-methylpyrazin-2-yl)oxy]methyl}piperidin-1-yl)pyridine-3-carbonitrile chemical structure, C18H21N5O, CAS 2877750-73-5](/s/AXMRCRIUMVMONB-UHFFFAOYSA-N.svg)
6-Methyl-2-(4-{[(3-methylpyrazin-2-yl)oxy]methyl}piperidin-1-yl)pyridine-3-carbonitrile
CAS 2877750-73-5C18H21N5O
![6-{[2-(2-Aminoethyl)-1H-1,3-benzodiazol-1-yl]methyl}-N,N-dimethylpyridine-3-carboxamide chemical structure, C18H21N5O, CAS 2731014-48-3](/s/PIUUJHBZGYYJKI-UHFFFAOYSA-N.svg)
6-{[2-(2-Aminoethyl)-1H-1,3-benzodiazol-1-yl]methyl}-N,N-dimethylpyridine-3-carboxamide
CAS 2731014-48-3C18H21N5O
![1H-Pyrazolo[4,3-c]pyridine, 4-(cyclohexyloxy)-3-[(1E)-2-(1-Methyl-1H-pyrazol-4-yl)ethenyl]- chemical structure, C18H21N5O, CAS 1367872-56-7](/s/FQAUEIZZMKBKKP-UHFFFAOYSA-N.svg)
1H-Pyrazolo[4,3-c]pyridine, 4-(cyclohexyloxy)-3-[(1E)-2-(1-Methyl-1H-pyrazol-4-yl)ethenyl]-
CAS 1367872-56-7C18H21N5O
![2-Dimethylamino-4-[3-(2-ethyl-6-methyl-4-pyridinyl)-[1,2,4]oxadiazol-5-yl]-6-methylpyridine chemical structure, C18H21N5O, CAS 1122087-26-6](/s/DNHLXOLTLWBBTP-UHFFFAOYSA-N.svg)
2-Dimethylamino-4-[3-(2-ethyl-6-methyl-4-pyridinyl)-[1,2,4]oxadiazol-5-yl]-6-methylpyridine
CAS 1122087-26-6C18H21N5O
![1-(2-Methoxyphenyl)-4-{2-methylpyrazolo[1,5-a]pyrazin-4-yl}piperazine chemical structure, C18H21N5O, CAS 2324677-09-8](/s/WHHVYBPPKHTJMN-UHFFFAOYSA-N.svg)
1-(2-Methoxyphenyl)-4-{2-methylpyrazolo[1,5-a]pyrazin-4-yl}piperazine
CAS 2324677-09-8C18H21N5O
![1-(3-Methoxyphenyl)-4-{2-methylpyrazolo[1,5-a]pyrazin-4-yl}piperazine chemical structure, C18H21N5O, CAS 2327517-93-9](/s/FYENQFVHLBIGCN-UHFFFAOYSA-N.svg)
1-(3-Methoxyphenyl)-4-{2-methylpyrazolo[1,5-a]pyrazin-4-yl}piperazine
CAS 2327517-93-9C18H21N5O
![7-(Hexylamino)-2-phenylpyrimido[4,5-d]pyrimidin-4(1H)-one chemical structure, C18H21N5O, CAS 918663-21-5](/s/XUTWDPHJEBWNRA-UHFFFAOYSA-N.svg)
7-(Hexylamino)-2-phenylpyrimido[4,5-d]pyrimidin-4(1H)-one
CAS 918663-21-5C18H21N5O
![2-[4-(5-Ethyl-6-methylpyrimidin-4-yl)piperazin-1-yl]-1,3-benzoxazole chemical structure, C18H21N5O, CAS 2415602-47-8](/s/NKKUBWVRACXQQE-UHFFFAOYSA-N.svg)
2-[4-(5-Ethyl-6-methylpyrimidin-4-yl)piperazin-1-yl]-1,3-benzoxazole
CAS 2415602-47-8C18H21N5O
![1-Methyl-2-(3-{[(6-methylpyridazin-3-yl)oxy]methyl}pyrrolidin-1-yl)-1H-1,3-benzodiazole chemical structure, C18H21N5O, CAS 2548994-43-8](/s/ITBBFPGGDQQSTG-UHFFFAOYSA-N.svg)
1-Methyl-2-(3-{[(6-methylpyridazin-3-yl)oxy]methyl}pyrrolidin-1-yl)-1H-1,3-benzodiazole
CAS 2548994-43-8C18H21N5O
![1-(2-Methoxyphenyl)-4-{3-methyl-3H-imidazo[4,5-b]pyridin-2-yl}piperazine chemical structure, C18H21N5O, CAS 2326302-71-8](/s/JEDFPFQTWFTFNZ-UHFFFAOYSA-N.svg)
1-(2-Methoxyphenyl)-4-{3-methyl-3H-imidazo[4,5-b]pyridin-2-yl}piperazine
CAS 2326302-71-8C18H21N5O
![1-(2-Methoxyphenyl)-4-{6-methyl-5H-pyrrolo[3,2-d]pyrimidin-4-yl}piperazine chemical structure, C18H21N5O, CAS 2742043-87-2](/s/PWEMVOHVYIDBHV-UHFFFAOYSA-N.svg)
1-(2-Methoxyphenyl)-4-{6-methyl-5H-pyrrolo[3,2-d]pyrimidin-4-yl}piperazine
CAS 2742043-87-2C18H21N5O
![N-(1-{Furo[3,2-c]pyridin-4-yl}piperidin-3-yl)-N,5-dimethylpyrimidin-2-amine chemical structure, C18H21N5O, CAS 2742056-41-1](/s/GOZDECWDCVLPAE-UHFFFAOYSA-N.svg)
N-(1-{Furo[3,2-c]pyridin-4-yl}piperidin-3-yl)-N,5-dimethylpyrimidin-2-amine
CAS 2742056-41-1C18H21N5O
![6-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-[2-(4-methoxyphenyl)ethyl]pyrimidin-4-amine chemical structure, C18H21N5O, CAS 2742065-58-1](/s/RDECEJUXIJPRMJ-UHFFFAOYSA-N.svg)
6-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-[2-(4-methoxyphenyl)ethyl]pyrimidin-4-amine
CAS 2742065-58-1C18H21N5O
![6-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-[2-(2-methoxyphenyl)ethyl]pyrimidin-4-amine chemical structure, C18H21N5O, CAS 2742042-02-8](/s/BVRZREAHWOOVEL-UHFFFAOYSA-N.svg)
6-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-[2-(2-methoxyphenyl)ethyl]pyrimidin-4-amine
CAS 2742042-02-8C18H21N5O
![6-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-[2-(3-methoxyphenyl)ethyl]pyrimidin-4-amine chemical structure, C18H21N5O, CAS 2742042-07-3](/s/QVQDSJLNOMPMDK-UHFFFAOYSA-N.svg)
6-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-[2-(3-methoxyphenyl)ethyl]pyrimidin-4-amine
CAS 2742042-07-3C18H21N5O
![N-[1-(1,3-Benzoxazol-2-yl)piperidin-3-yl]-N,5-dimethylpyrimidin-2-amine chemical structure, C18H21N5O, CAS 2742068-86-4](/s/MQJGVNXLKOALEU-UHFFFAOYSA-N.svg)
N-[1-(1,3-Benzoxazol-2-yl)piperidin-3-yl]-N,5-dimethylpyrimidin-2-amine
CAS 2742068-86-4C18H21N5O
![2-[5-(6-Phenylpyridazin-3-yl)-octahydropyrrolo[3,4-c]pyrrol-2-yl]acetamide chemical structure, C18H21N5O, CAS 2415512-52-4](/s/GBTZJTBNZZTGEZ-UHFFFAOYSA-N.svg)
2-[5-(6-Phenylpyridazin-3-yl)-octahydropyrrolo[3,4-c]pyrrol-2-yl]acetamide
CAS 2415512-52-4C18H21N5O
- 2-{5-[(3,5-Dimethyl-1,2-oxazol-4-yl)methyl]-octahydropyrrolo[3,4-c]pyrrol-2-yl}pyridine-3-carbonitrile2741957-93-5C18H21N5O
- 3-Methyl-4-[(1-{pyrazolo[1,5-a]pyrimidin-5-yl}piperidin-4-yl)methoxy]pyridine2742040-25-9C18H21N5O
- 4-[(1-{Imidazo[1,2-b]pyridazin-6-yl}piperidin-4-yl)methoxy]-3-methylpyridine2741894-13-1C18H21N5O
- 5-(6-Methylpyrimidin-4-yl)-N-phenyl-octahydropyrrolo[3,4-c]pyrrole-2-carboxamide2742020-13-7C18H21N5O
- 6-(4-Benzylpiperidin-1-yl)-9-methyl-8,9-dihydro-7H-purin-8-one2742047-38-5C18H21N5O
- N-(2,6-Dimethylphenyl)-9-[(oxolan-2-yl)methyl]-9H-purin-6-amine2741943-88-2C18H21N5O
- 2-{3-[(2-Ethyl-1H-imidazol-1-yl)methyl]azetidin-1-yl}-3-methyl-3,4-dihydroquinazolin-4-one2742016-49-3C18H21N5O
- 2-{4-[(3,6-Dimethylpyrazin-2-yl)oxy]piperidin-1-yl}-6-methylpyridine-3-carbonitrile2742041-23-0C18H21N5O
- 4-[4-(Pyridine-3-carbonyl)piperazin-1-yl]-5,6,7,8-tetrahydroquinazoline2770600-43-4C18H21N5O
- N-[(4-Methylphenyl)methyl]-9-[(oxolan-2-yl)methyl]-9H-purin-6-amine2770621-70-8C18H21N5O
- 9-Cyclopropyl-N-[2-(3,5-dimethylphenoxy)ethyl]-9H-purin-6-amine2770623-82-8C18H21N5O
- 4-Cyclobutyl-6-[4-(pyridine-3-carbonyl)piperazin-1-yl]pyrimidine2770634-66-5C18H21N5O
- 9-[(Oxolan-2-yl)methyl]-N-(2-phenylethyl)-9H-purin-6-amine2770586-55-3C18H21N5O
- N-(3,5-Dimethylphenyl)-9-[(oxolan-2-yl)methyl]-9H-purin-6-amine2770623-31-7C18H21N5O
- N-(2-Ethylphenyl)-9-[(oxolan-2-yl)methyl]-9H-purin-6-amine2770605-91-7C18H21N5O
- 1-Methyl-2-{3-[(pyrazin-2-yloxy)methyl]piperidin-1-yl}-1H-1,3-benzodiazole2770584-27-3C18H21N5O
- 4,6-Dimethyl-2-{3-[(pyrazin-2-yloxy)methyl]piperidin-1-yl}pyridine-3-carbonitrile2770590-75-3C18H21N5O
- N-(4-Ethylphenyl)-9-[(oxolan-2-yl)methyl]-9H-purin-6-amine2770605-57-5C18H21N5O
- (4-Methyl-5-(2-((3-phenylpropyl)amino)pyridin-4-yl)-4H-1,2,4-triazol-3-yl)methanol865815-16-3C18H21N5O
- N-(1-{Furo[3,2-c]pyridin-4-yl}piperidin-3-yl)-N,6-dimethylpyrimidin-4-amine3030848-30-4C18H21N5O
- 3-{[4-(5,6-Dimethylpyrimidin-4-yl)piperazin-1-yl]methyl}-1,2-benzoxazole3030820-02-8C18H21N5O
- 3-{[4-(4,6-Dimethylpyrimidin-2-yl)piperazin-1-yl]methyl}-1,2-benzoxazole3030726-88-3C18H21N5O
- 2-{3-[(4-Methoxypyrimidin-2-yl)(methyl)amino]piperidin-1-yl}benzonitrile3054570-56-5C18H21N5O
- 3-{[4-(5-Ethylpyrimidin-2-yl)piperazin-1-yl]methyl}-1,2-benzoxazole3054607-76-7C18H21N5O
- N-[(1,2-Benzoxazol-3-yl)methyl]-1-(5,6-dimethylpyrimidin-4-yl)-N-methylazetidin-3-amine3054562-41-0C18H21N5O
- N-[(1,2-Benzoxazol-3-yl)methyl]-1-(2,6-dimethylpyrimidin-4-yl)-N-methylazetidin-3-amine3030845-73-6C18H21N5O
- 4-{3-[(6-Methoxypyrimidin-4-yl)(methyl)amino]piperidin-1-yl}benzonitrile3054639-23-2C18H21N5O
- 4-{3-[(4-Methoxypyrimidin-2-yl)(methyl)amino]piperidin-1-yl}benzonitrile3054608-61-3C18H21N5O
- N-[1-(4-Cyanophenyl)piperidin-3-yl]-1,3-dimethyl-1H-pyrazole-5-carboxamide3054634-07-7C18H21N5O
- N-[1-(4-Cyanophenyl)piperidin-4-yl]-1,5-dimethyl-1H-pyrazole-3-carboxamide3054629-74-9C18H21N5O
- N-{1-[(3-Cyanophenyl)methyl]piperidin-3-yl}-1-methyl-1H-pyrazole-4-carboxamide3030829-17-2C18H21N5O
- N-{1-[(4-Cyanophenyl)methyl]piperidin-3-yl}-1-methyl-1H-pyrazole-4-carboxamide3030782-15-8C18H21N5O
- N-{1-[(3-Cyanophenyl)methyl]piperidin-3-yl}-1-methyl-1H-pyrazole-3-carboxamide3054549-39-9C18H21N5O
- N-{1-[(3-Cyanophenyl)methyl]piperidin-4-yl}-1-methyl-1H-pyrazole-3-carboxamide3030816-22-6C18H21N5O
- N-{1-[(4-Cyanophenyl)methyl]piperidin-3-yl}-1-methyl-1H-pyrazole-3-carboxamide3054558-51-6C18H21N5O
- N-{1-[(4-Cyanophenyl)methyl]piperidin-4-yl}-1-methyl-1H-pyrazole-3-carboxamide3030802-98-0C18H21N5O
- 1-(1-(1-(Pyrimidin-2-yl)ethyl)piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one2323498-95-7C18H21N5O
- 1-(1-(3,4-Diaminophenyl)piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one1393444-11-5C18H21N5O
- 1-(1-((2-Aminopyridin-3-yl)methyl)piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one2422463-68-9C18H21N5O
- 1-(1-((4-Methylpyrimidin-2-yl)methyl)piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one2423356-69-6C18H21N5O
- 3-[(5,6-Dimethyl-2-phenyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino]-N-methylpropanamide251946-26-6C18H21N5O
- 4-Amino-N-ethyl-N-[2-(6-methyl-1H-benzimidazol-2-yl)ethyl]-2-pyridinecarboxamide1268984-64-0C18H21N5O
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 1-Methyl-1-[1-(6-phenylpyridazin-3-yl)azetidin-3-yl]-3-(prop-2-en-1-yl)urea, 1-Methyl-3-{3-[2-(propan-2-yl)-1H-1,3-benzodiazol-1-yl]azetidin-1-yl}-1,2-dihydropyrazin-2-one, 3-Methyl-6-{3-[2-(propan-2-yl)-1H-1,3-benzodiazol-1-yl]azetidin-1-yl}-3,4-dihydropyrimidin-4-one. 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.