Molecular formula
C18H21NO4
415 compounds have this formula on CompoundList.
- Molar mass
- 315.37g/mol
- Monoisotopic mass
- 321.1847Da
- Atoms
- 44
- Elements
- 4
- Rings plus double bonds
- 9
The formula C18H21NO4 describes a molecule made of 18 carbon atoms, 21 hydrogen atoms, 1 nitrogen atom and 4 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 × 1868.55%12.011 × 18 = 216.198 g/mol
- H Hydrogen × 216.71%1.008 × 21 = 21.168 g/mol
- N Nitrogen × 14.44%14.007 × 1 = 14.007 g/mol
- O Oxygen × 420.29%15.999 × 4 = 63.996 g/mol
Look up another formula
Compounds with the formula C18H21NO4
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 415 compounds
Oxycodone
CAS 76-42-6C18H21NO4
Cephalotaxine
CAS 24316-19-6C18H21NO4
Methyl 5-(benzyloxycarbonyl)-2,4-dimethyl-3-pyrrolepropionate
CAS 20303-31-5C18H21NO4
3,5-Dimethyl 1,4-dihydro-2,6-dimethyl-4-(4-methylphenyl)-3,5-pyridinedicarboxylate
CAS 73257-48-4C18H21NO4
14-Hydroxycodeine
CAS 4829-46-3C18H21NO4
(±)-Norreticuline
CAS 13168-51-9C18H21NO4
Alkaloid A from Cephalotaxus
CAS 38848-21-4C18H21NO4
Homolycorine
CAS 477-20-3C18H21NO4
AC-7739 free base
CAS 162705-07-9C18H21NO4
N-(2-Ethylphenyl)-3,4,5-trimethoxybenzamide
CAS 299950-95-1C18H21NO4
N-(3,4-Dimethylphenyl)-3,4,5-trimethoxybenzamide
CAS 87723-23-7C18H21NO4
Codeine N-oxide
CAS 3688-65-1C18H21NO4
N-(2,5-Dimethoxyphenyl)-2-(2,5-dimethylphenoxy)acetamide
CAS 315712-98-2C18H21NO4
Boc-3-(2-naphthyl)-L-alanine
CAS 58438-04-3C18H21NO4
(2R)-2-(((tert-Butoxy)carbonyl)amino)-3-(naphthalen-2-yl)propanoic acid
CAS 76985-10-9C18H21NO4
10-Hydroxycodeine
CAS 1777-89-5C18H21NO4
Buphanidrine
CAS 1162-10-3C18H21NO4
N-Cyclohexyl-2-(4-methyl-2-oxochromen-7-yl)oxyacetamide
CAS 300814-09-9C18H21NO4
![N-{[4-(4-Methoxyphenyl)oxan-4-yl]methyl}furan-2-carboxamide chemical structure, C18H21NO4, CAS 633284-07-8](/s/ZJFSORDRRPVUNL-UHFFFAOYSA-N.svg)
N-{[4-(4-Methoxyphenyl)oxan-4-yl]methyl}furan-2-carboxamide
CAS 633284-07-8C18H21NO4
![(3S)-3-{[(tert-Butoxy)carbonyl]amino}-3-(naphthalen-1-yl)propanoic acid chemical structure, C18H21NO4, CAS 500770-68-3](/s/YDSAGJMVVUBPOK-HNNXBMFYSA-N.svg)
(3S)-3-{[(tert-Butoxy)carbonyl]amino}-3-(naphthalen-1-yl)propanoic acid
CAS 500770-68-3C18H21NO4
2-(3,4-Dimethoxyphenyl)-N-(2-methoxybenzyl)acetamide
CAS 349408-02-2C18H21NO4
![3-Hydroxy-4-(morpholin-4-ylmethyl)-7,8,9,10-tetrahydrobenzo[c]chromen-6-one chemical structure, C18H21NO4, CAS 17792-11-9](/s/PCZHTJNPPCHGQF-UHFFFAOYSA-N.svg)
3-Hydroxy-4-(morpholin-4-ylmethyl)-7,8,9,10-tetrahydrobenzo[c]chromen-6-one
CAS 17792-11-9C18H21NO4
Boc-(R)-3-Amino-3-(1-naphthyl)-propionic acid
CAS 500789-00-4C18H21NO4
3-(2,6-Dimethyl-piperidine-1-carbonyl)-8-methoxy-chromen-2-one
CAS 326884-23-5C18H21NO4
- 1-[4-Acetyl-1-(3,4-dimethoxyphenyl)-2,5-dimethylpyrrol-3-yl]ethanone461437-06-9C18H21NO4
- Ethyl 4-(3-(5-ethylfuran-2-yl)propanamido)benzoate720677-75-8C18H21NO4
- Oxycodone-D6152477-91-3C18H21NO4
- 4-[3-(Ethoxycarbonyl)-2-methyl-5-phenyl-1H-pyrrol-1-yl]butanoic acid879329-73-4C18H21NO4
- Methyl 6,6-dimethyl-2,4-dioxo-3-{[benzylamino]methylene}cyclohexanecarboxylate1164481-78-0C18H21NO4
- 1-Ethyl-4-m-tolyl-1,4-dihydro-pyridine-3,5-dicarboxylic acid dimethyl ester347324-45-2C18H21NO4
- Oxycodone, (N-methyl-d3)-145225-02-1C18H21NO4
- Ethyl 3-(cyclohexanecarboxamido)benzofuran-2-carboxylate477500-63-3C18H21NO4
- N-[2-(3,4-Dimethoxyphenyl)ethyl]-4-methoxybenzamide15547-66-7C18H21NO4
- 3-{[(tert-Butoxy)carbonyl]amino}-2-(naphthalen-2-yl)propanoic acid1310680-25-1C18H21NO4
- 2-(2,4-Dimethoxyphenyl)-5,6-dimethyl-3a,4,7,7a-tetrahydro-1H-isoindole-1,3(2H)-dione444057-77-6C18H21NO4
- N-(2,4-Dimethoxyphenyl)-2-(3,4-dimethylphenoxy)acetamide303990-07-0C18H21NO4
- 1-(3,4-Dimethoxyphenyl)-3-(4-methoxyanilino)-1-propanone477320-14-2C18H21NO4
- Benzyl 5-acetoxymethyl-4-ethyl-3-methyl-2-pyrrolecarboxylate3750-36-5C18H21NO4
- 1-{5-[(4-Ethoxyphenoxy)methyl]-2-furoyl}pyrrolidine438467-99-3C18H21NO4
- N-(2,4-Dimethylphenyl)-3,4,5-trimethoxybenzamide300825-95-0C18H21NO4
- N-(2,6-Dimethylphenyl)-3,4,5-trimethoxybenzamide6597-31-5C18H21NO4
- 3-(2,4-Dimethoxyanilino)-1-(4-methoxyphenyl)-1-propanone477319-01-0C18H21NO4
- Methyl 3-[(2-furylcarbonyl)amino]-3-(4-isopropylphenyl)propanoate478249-91-1C18H21NO4
- [2-[2-(Cyclohexen-1-yl)ethylamino]-2-oxoethyl] 4-formylbenzoate1031070-57-1C18H21NO4
- 3-Hydroxy-2-nitroestra-1,3,5(10)-trien-17-one5976-73-8C18H21NO4
- (S)-Norreticuline4781-58-2C18H21NO4
- N,N-Dimethyl-2-[(3-methyl-6-oxo-7,8,9,10-tetrahydro-6H-benzo[c]chromen-1-yl)oxy]acetamide307550-51-2C18H21NO4
- N-(2,4-Dimethoxyphenyl)-2-(2,5-dimethylphenoxy)acetamide315712-97-1C18H21NO4
- N-(2,4-Dimethoxyphenyl)-2-(2,4-dimethylphenoxy)acetamide423151-85-3C18H21NO4
- Ethyl methyl 2,6-dimethyl-4-phenyl-1,4-dihydropyridine-3,5-dicarboxylate39562-02-2C18H21NO4
- N-(2,5-Dimethoxyphenyl)-3-(3-methylphenoxy)propanamide765285-37-8C18H21NO4
- Ethyl 4-(3,4-dimethoxybenzylamino)benzoate13160-01-5C18H21NO4
- Ethyl 5-(benzyloxycarbonyl)-2,4-dimethyl-3-pyrroleacetate52091-12-0C18H21NO4
- Oxycodone-(methoxy-d3)160227-46-3C18H21NO4
- 2H-Chromene-3-carboxylic acid 1-cyclopentylcarbamoyl-ethyl ester626219-68-9C18H21NO4
- 4-Nitroestrone5976-74-9C18H21NO4
- (R)-Norreticuline57231-34-2C18H21NO4
- Methyl 3-(4-nitrophenyl)adamantane-1-carboxylate15228-42-9C18H21NO4
- N-(2,4-Dimethoxyphenyl)-3-(4-methoxyphenyl)propanamide545348-50-3C18H21NO4
- 3,4,5-Trimethoxy-N-(2-phenylethyl)benzamide60273-40-7C18H21NO4
- Methyl 2-{[(3,3-dimethyl-2-oxobicyclo[2.2.1]hept-1-yl)carbonyl]amino}benzoate609334-80-7C18H21NO4
- 1,4-Dihydro-2,6-dimethyl-4-(3-methylphenyl)-3,5-pyridinedicarboxylic acid dimethyl ester80307-08-0C18H21NO4
- 1-[2-(3,4-Dimethoxyphenyl)ethyl]-3,4,6,7-tetrahydrocyclopenta[b]pyridine-2,5-dione2349-42-0C18H21NO4
- 2-(2-Methoxy-4-methylphenoxy)-N-(2-methoxy-5-methylphenyl)acetamide853332-78-2C18H21NO4
- N-(4-Ethoxyphenyl)-2-(2-methoxy-4-methylphenoxy)acetamide853331-86-9C18H21NO4
- 2-(7,7-Dimethylbicyclo(3.1.1)hept-2-EN-2-yl)ethyl 4-nitrobenzoate79552-27-5C18H21NO4
- Dimethyl 1-(2-isopropylphenyl)-2-methyl-1H-pyrrole-3,4-dicarboxylate853319-14-9C18H21NO4
- 4-Benzyl 2-ethyl 3-ethyl-2-methyl-2,4-pyrroledicarboxylate4949-46-6C18H21NO4
- 8-(3-Diethylaminopropoxy)psoralen85079-39-6C18H21NO4
- N-Ethyl-3,4,5-trimethoxy-N-phenylbenzamide107778-19-8C18H21NO4
- N-(4-Isopropoxyphenyl)-2,6-dimethoxybenzamide450390-61-1C18H21NO4
- 3-{[2-(4-Methoxyphenyl)ethyl]carbamoyl}bicyclo[2.2.1]hept-5-ene-2-carboxylic acid470472-66-3C18H21NO4
- Ethyl 3-benzoyl-9-oxo-3-azabicyclo[3.3.1]nonane-7-carboxylate37943-62-7C18H21NO4
- Dimethyl 1,2,6-trimethyl-4-phenyl-1,4-dihydropyridine-3,5-dicarboxylate70008-26-3C18H21NO4
- Wisanine61756-56-7C18H21NO4
- [2-(Furan-2-ylmethylamino)-2-oxoethyl] 4-tert-butylbenzoate387841-25-0C18H21NO4
- 1-(Benzo[d][1,3]dioxol-5-yl)-N-(2-ethoxy-3-methoxybenzyl)methanamine1048947-18-7C18H21NO4
- 3-(3,5-Dimethylpiperidine-1-carbonyl)-6-methoxy-2H-chromen-2-one728016-99-7C18H21NO4
- N-(1,3-Benzodioxol-5-ylmethyl)-2-(3,4-dimethoxyphenyl)ethanamine111355-37-4C18H21NO4
- n-Dihydroferuloyltyramine184877-32-5C18H21NO4
- N-(3,5-Dimethylphenyl)-3,4,5-trimethoxybenzamide300825-98-3C18H21NO4
- Codeine-7,8-oxide72785-20-7C18H21NO4
- 3-(4-Nitrophenyl)tricyclo[3.3.1.13,7]decane-1-acetic acid161036-57-3C18H21NO4
- Methyl 1-[(7-methyl-2-oxochromen-4-yl)methyl]piperidine-4-carboxylate903192-96-1C18H21NO4
- 3-(3,5-Dimethylpiperidine-1-carbonyl)-8-methoxy-2H-chromen-2-one728016-96-4C18H21NO4
- N-(2,4-Dimethoxyphenyl)-4-propan-2-yloxybenzamide433706-07-1C18H21NO4
- N-(Furan-2-ylmethyl)-4-(4-methoxyphenyl)tetrahydro-2H-pyran-4-carboxamide695220-04-3C18H21NO4
- N-(1,3-Benzodioxol-5-yl)-4,7,7-trimethyl-3-oxobicyclo[2.2.1]heptane-1-carboxamide618402-26-9C18H21NO4
- N-(2,4-Dimethoxyphenyl)-2-(4-ethylphenoxy)acetamide301157-75-5C18H21NO4
- 5-(3-Diethylaminopropoxy)psoralen85079-38-5C18H21NO4
- Isocephalotaxine73208-54-5C18H21NO4
- 1-(3-((Dimethylamino)methyl)-2,4-dihydroxyphenyl)-2-(4-methoxyphenyl)ethanone1021218-37-0C18H21NO4
- 1-(3-((Dimethylamino)methyl)-2,4-dihydroxyphenyl)-2-(2-methoxyphenyl)ethanone1021218-38-1C18H21NO4
- Codeine impurity 16240131-71-9C18H21NO4
- Dimethyl 2,6-dimethyl-4-(o-tolyl)-1,4-dihydropyridine-3,5-dicarboxylate73257-44-0C18H21NO4
- Talibegron146376-58-1C18H21NO4
- N-(4-Ethoxyphenyl)-1-(3,4,5-trimethoxyphenyl)methanimine158319-78-9C18H21NO4
- (S)-3'-Hydroxy-N-methylcoclaurine1936-17-0C18H21NO4
- 1-(3,4-Dimethoxyphenyl)-N-[(3,4-dimethoxyphenyl)methyl]methanimine57535-59-8C18H21NO4
- N-(3-Hydroxy-4-(hydroxymethyl)cyclopentyl)-2-(naphthalen-2-yloxy)acetamide1421453-08-8C18H21NO4
Frequently asked questions
What is the molar mass of C18H21NO4?
The molar mass of C18H21NO4 is 315.37 g/mol, calculated from standard atomic weights for 18 carbon atoms, 21 hydrogen atoms, 1 nitrogen atom and 4 oxygen atoms. The monoisotopic mass is 321.1847 Da.
How many compounds have the formula C18H21NO4?
CompoundList lists 415 compounds with the molecular formula C18H21NO4, including Oxycodone, Cephalotaxine, Methyl 5-(benzyloxycarbonyl)-2,4-dimethyl-3-pyrrolepropionate. 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 C18H21NO4?
C18H21NO4 has a degree of unsaturation of 9. 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.