Molecular formula

C₂₁H₂₈O₃

144 compounds have this formula on CompoundList.

Molar mass: 328.45g/mol
Monoisotopic mass: 328.2038Da
Atoms: 52
Elements: 3
Rings plus double bonds: 8

The formula C21H28O3 describes a molecule made of 21 carbon atoms, 28 hydrogen 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 × 2176.79%
12.011 × 21 = 252.231 g/mol
H Hydrogen × 288.59%
1.008 × 28 = 28.224 g/mol
O Oxygen × 314.61%
15.999 × 3 = 47.997 g/mol

Look up another formula

Compounds with the formula C21H28O3

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

Showing 101 to 144 of 144 compounds

3-Hydroxyestra-1,3,5(10)-trien-17alpha-yl propanoate

CAS 182624-56-2C₂₁H₂₈O₃

1-Methoxy-15,20-cycloprosta-8(12),15,17,19-tetraene-9,11-dione

CAS 62788-20-9C₂₁H₂₈O₃

Tetrahydrocannabivarin acetate

CAS 885123-57-9C₂₁H₂₈O₃

(Z,8S)-1,11-Bis(furan-3-yl)-4,8-dimethylundec-4-en-6-one

C₂₁H₂₈O₃

1-Pentan-3-yloxy-4-((4-propan-2-yloxyphenyl)methoxy)benzene

CAS 128631-95-8C₂₁H₂₈O₃

[(1S,2S,5S,9S,10R,13S,15S)-5-Methyl-6-oxo-15-pentacyclo[11.4.1.01,13.02,10.05,9]octadec-11-enyl] acetate

CAS 69269-55-2C₂₁H₂₈O₃

2-Methoxy-4-methyl-1-[3-(5-methyl-2-propan-2-ylphenoxy)propoxy]benzene

CAS 6441-71-0C₂₁H₂₈O₃

Clascoterone impurity 1

CAS 39833-17-5C₂₁H₂₈O₃

1-Octanol, 8-[4-(phenylmethoxy)phenoxy]-

CAS 519186-18-6C₂₁H₂₈O₃

1-(7-tert-Butyl-3,3-dimethyl-2,3-dihydro-1-benzofuran-5-yl)-4-cyclopropylbut-2-yne-1,4-diol

CAS 481088-26-0C₂₁H₂₈O₃

1-Decanone, 1-(3,4-dihydroxy-7-methyl-2-naphthalenyl)-

CAS 61983-47-9C₂₁H₂₈O₃

3-Hydroxyestra-1(10),2,4-trien-17-yl propanoate

CAS 1298116-88-7C₂₁H₂₈O₃

1,3-Bis[4-(propan-2-yl)phenoxy]propan-2-ol

CAS 136795-25-0C₂₁H₂₈O₃

Phenol, 4-(1,1,3,3-tetramethylbutyl)-, benzoate

CAS 94899-70-4C₂₁H₂₈O₃

6-[(4'-Propoxy[1,1'-biphenyl]-4-yl)oxy]-1-hexanol

CAS 143363-39-7C₂₁H₂₈O₃

17beta-Acetoxy-4alpha,5-cyclo-a-homo-b-nor-5alpha-androst-1-en-3-one

CAS 64604-15-5C₂₁H₂₈O₃

1,3-Bis(2,4,6-trimethylphenoxy)propan-2-ol

CAS 2034155-53-6C₂₁H₂₈O₃

17beta-Hydroxy-17alpha-methylestra-1(10),2,4-trien-3-yl acetate

CAS 5774-15-2C₂₁H₂₈O₃

4-Hydroxy-2-methylestra-1,3,5(10)-trien-17beta-yl acetate

CAS 6223-90-1C₂₁H₂₈O₃

Acetaldehyde, butyl 2-methoxy-1,2-diphenylethyl acetal

CAS 97657-95-9C₂₁H₂₈O₃

2-Methyl-4-oxo-3-(1,3-pentadien-1-yl)-2-cyclopenten-1-yl 2,2-dimethyl-3-(2-methyl-1-propen-1-yl)cyclopropanecarboxylate

CAS 5768-81-0C₂₁H₂₈O₃

Progesterone impurity 1

CAS 37717-13-8C₂₁H₂₈O₃

(7E)-1,11-Bis(3-furanyl)-4,8-dimethyl-7-undecen-5-one

CAS 60463-89-0C₂₁H₂₈O₃

Benzoic acid--4-octylphenol (1/1)

CAS 89202-50-6C₂₁H₂₈O₃

Frequently asked questions

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What is the molar mass of C21H28O3?

The molar mass of C21H28O3 is 328.45 g/mol, calculated from standard atomic weights for 21 carbon atoms, 28 hydrogen atoms and 3 oxygen atoms. The monoisotopic mass is 328.2038 Da.

How many compounds have the formula C21H28O3?

CompoundList lists 144 compounds with the molecular formula C21H28O3, including 3-Hydroxyestra-1,3,5(10)-trien-17alpha-yl propanoate, 1-Methoxy-15,20-cycloprosta-8(12),15,17,19-tetraene-9,11-dione, Tetrahydrocannabivarin acetate. 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 C21H28O3?

C21H28O3 has a degree of unsaturation of 8. 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.