Molecular formula

C₂₁H₁₈O₈

24 compounds have this formula on CompoundList.

Molar mass: 398.37g/mol
Monoisotopic mass: 402.1224Da
Atoms: 47
Elements: 3
Rings plus double bonds: 13

The formula C21H18O8 describes a molecule made of 21 carbon atoms, 18 hydrogen atoms and 8 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 × 2163.32%
12.011 × 21 = 252.231 g/mol
H Hydrogen × 184.55%
1.008 × 18 = 18.144 g/mol
O Oxygen × 832.13%
15.999 × 8 = 127.992 g/mol

Look up another formula

Compounds with the formula C21H18O8

Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.

Showing 1 to 24 of 24 compounds

(+)-Daunomycinone

CAS 21794-55-8C₂₁H₁₈O₈

7-Deoxydoxorubicinone

CAS 38554-25-5C₂₁H₁₈O₈

Methyl (1R,2R,4S)-1,2,3,4,6,11-hexahydro-2,4,5,7-tetrahydroxy-2-methyl-6,11-dioxo-1-naphthacenecarboxylate

CAS 78173-89-4C₂₁H₁₈O₈

5-(Acetyloxy)-3-methoxy-2-(4-methoxyphenyl)-4-oxo-4H-chromen-7-yl acetate

CAS 6320-37-2C₂₁H₁₈O₈

3-((2-Methoxyethoxy)carbonyl)-2-methylbenzofuran-5-yl benzo[d][1,3]dioxole-5-carboxylate

CAS 896069-17-3C₂₁H₁₈O₈

Mitorubrinol

CAS 3215-47-2C₂₁H₁₈O₈

4'-Demethylpodophyllotoxone

CAS 93780-84-8C₂₁H₁₈O₈

3,4-Dihydro-8,13-dihydroxy-2,2,5,10-tetramethyl-4,11-dioxo-2H,11H-1-benzopyrano(6,7-b)(1,4)benzodioxepin-7-carboxaldehyde

CAS 1179374-69-6C₂₁H₁₈O₈

Methyl {[5-(2-methoxy-2-oxoethoxy)-4-oxo-2-phenyl-4H-chromen-7-yl]oxy}acetate

CAS 306729-89-5C₂₁H₁₈O₈

Methyl 4-{[7-(2-methoxy-2-oxoethoxy)-2-methyl-4-oxo-4H-chromen-3-yl]oxy}benzoate

CAS 858766-15-1C₂₁H₁₈O₈

Kanglexin

CAS 2228847-12-7C₂₁H₁₈O₈

Ethyl 2-{3-[4-(methoxycarbonyl)phenoxy]-4-oxochromen-7-yloxy}acetate

CAS 294855-15-5C₂₁H₁₈O₈

2-(3,4-Dimethoxyphenyl)-2-oxoethyl 8-methoxy-2-oxo-2H-chromene-3-carboxylate

CAS 923681-21-4C₂₁H₁₈O₈

2-(4-(Acetyloxy)phenyl)-4-oxo-3,4-dihydro-2H-1-benzopyran-5,7-diyl diacetate

CAS 73111-01-0C₂₁H₁₈O₈

Naringenin triacetate

CAS 3682-04-0C₂₁H₁₈O₈

Daunomycinon

CAS 59325-98-3C₂₁H₁₈O₈

2,2'-[(4-Oxo-2-phenyl-4H-chromene-5,7-diyl)bis(oxy)]dipropanoic acid

CAS 307525-69-5C₂₁H₁₈O₈

2,5,7-Trihydroxy-3,9-dimethoxy-2-methyl-3,4-dihydrotetracene-1,6,11-trione

CAS 57847-75-3C₂₁H₁₈O₈

4H-1-Benzopyran-4-one, 5,7-bis(acetyloxy)-6-methoxy-2-(4-methoxyphenyl)-

CAS 28736-80-3C₂₁H₁₈O₈

Acetic acid, ((4,7-dimethoxy-5-(3-(4-hydroxyphenyl)-1-oxo-2-propenyl)-6-benzofuranyl)oxy)-

CAS 51594-78-6C₂₁H₁₈O₈

6-((2-(3,4-Dihydroxyphenyl)-4-oxo-4H-chromen-3-yl)oxy)-6-oxohexanoic acid

CAS 909529-64-2C₂₁H₁₈O₈

Daunomycinone-d3

CAS 1217860-39-3C₂₁H₁₈O₈

Daunomycinone-13C,d3

CAS 1217837-48-3C₂₁H₁₈O₈

4H-1-Benzopyran-4-one,5-(acetyloxy)-2-[4-(acetyloxy)phenyl]-6,7-dimethoxy-

CAS 6601-54-3C₂₁H₁₈O₈

Frequently asked questions

Still have a question?

The help centre explains buying, quotes and supplier badges step by step, or you can write to our team.

Help centre Contact us

What is the molar mass of C21H18O8?

The molar mass of C21H18O8 is 398.37 g/mol, calculated from standard atomic weights for 21 carbon atoms, 18 hydrogen atoms and 8 oxygen atoms. The monoisotopic mass is 402.1224 Da.

How many compounds have the formula C21H18O8?

CompoundList lists 24 compounds with the molecular formula C21H18O8, including (+)-Daunomycinone, 7-Deoxydoxorubicinone, Methyl (1R,2R,4S)-1,2,3,4,6,11-hexahydro-2,4,5,7-tetrahydroxy-2-methyl-6,11-dioxo-1-naphthacenecarboxylate. 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 C21H18O8?

C21H18O8 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.