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 1 to 100 of 144 compounds
Pregn-4-ene-3,11,20-trione
CAS 516-15-4C21H28O3
3-Hydroxy-2-((1R,6R)-3-methyl-6-(1-methylethenyl)-2-cyclohexen-1-yl)-5-pentyl-2,5-cyclohexadiene-1,4-dione
CAS 137252-25-6C21H28O3
Pyrethrin I
CAS 121-21-1C21H28O3
Nomegestrol
CAS 58691-88-6C21H28O3
Estradiol, 17-propionate
CAS 3758-34-7C21H28O3
Puupehenone
CAS 73573-17-8C21H28O3
21-Hydroxypregna-1,4-diene-3,20-dione
CAS 5508-55-4C21H28O3
16alpha,17alpha-Epoxyprogesterone
CAS 1097-51-4C21H28O3
6beta-Hydroxylevonorgestrel
CAS 55555-97-0C21H28O3
Boldenone acetate
CAS 2363-59-9C21H28O3
SC 8109
CAS 1722-54-9C21H28O3
(6aR,10aR)-6a,7,10,10a-Tetrahydro-1-hydroxy-6,6-dimethyl-3-pentyl-6H-dibenzo(b,d)pyran-9-carboxaldehyde
CAS 53865-18-2C21H28O3
![(7R,8S,9S,10S,13S,14S,17R)-17-Ethynyl-10,17-dihydroxy-7,13-dimethyl-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-3-one chemical structure, C21H28O3, CAS 105186-35-4](/s/YMNJMUUOXMIQOT-GWXLLEQUSA-N.svg)
(7R,8S,9S,10S,13S,14S,17R)-17-Ethynyl-10,17-dihydroxy-7,13-dimethyl-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-3-one
CAS 105186-35-4C21H28O3
Avarone A
CAS 130203-67-7C21H28O3
Pregn-4-en-3,6,20-trione
CAS 2243-08-5C21H28O3
20R-Hydroxypregna-4,6-diene-3,12-dione
CAS 924910-83-8C21H28O3
17-Hydroxypregna-4,9(11)-diene-3,20-dione
CAS 34184-82-2C21H28O3
Furospongolide
CAS 76343-80-1C21H28O3
Methyl 7-oxodehydroabietate
CAS 17751-36-9C21H28O3
2-Phenanthrenecarboxylic acid, 3,4,4a,9,10,10a-hexahydro-8-methoxy-1,4a-dimethyl-7-(1-methylethyl)-
CAS 147362-43-4C21H28O3
(11beta)-11-Hydroxypregna-1,4-diene-3,20-dione
CAS 4224-37-7C21H28O3
![(3aS,3bR,9aR,9bS,11aS)-9a,11a-Dimethyl-2,3,3a,3b,4,5,7,9a,9b,10,11,11a-dodecahydrospiro[cyclopenta[a]phenanthrene-1,2'-[1,3]dioxolan]-7-one chemical structure, C21H28O3](/s/AOYBIWCQSGSYJF-OQPPHWFISA-N.svg)
(3aS,3bR,9aR,9bS,11aS)-9a,11a-Dimethyl-2,3,3a,3b,4,5,7,9a,9b,10,11,11a-dodecahydrospiro[cyclopenta[a]phenanthrene-1,2'-[1,3]dioxolan]-7-one
C21H28O3
![(17beta)-3-[(Oxiran-2-yl)methoxy]estra-1,3,5(10)-trien-17-ol chemical structure, C21H28O3, CAS 132008-46-9](/s/RBGCCCXOAAJQHS-GHBHFERXSA-N.svg)
(17beta)-3-[(Oxiran-2-yl)methoxy]estra-1,3,5(10)-trien-17-ol
CAS 132008-46-9C21H28O3
3-HO-10,11B-Dimethyl-decahydro-1H-benzo(A)fluorene-9-carboxylic acid ME ester
CAS 16996-09-1C21H28O3
- 4-Hydroxy-3-undecylnaphthalene-1,2-dione41245-59-4C21H28O3
- 6,7-Dihydroneridienone A72959-46-7C21H28O3
- 11,19-Oxidoprogesterone1913-28-6C21H28O3
- Methyl-4-oxoretinoate38030-58-9C21H28O3
- 17-Hydroxy-6-dehydroprogesterone2477-60-3C21H28O3
- 3,4-Seco-sonderianol85563-69-5C21H28O3
- Segesterone7690-08-6C21H28O3
- Dihydrofurospongin-235671-22-8C21H28O3
- (4aR)-2,3,4,4a-Tetrahydro-10-hydroxy-6-methoxy-1,1,4a-trimethyl-7-(1-methylethyl)-9(1H)-phenanthrenone140670-85-5C21H28O3
- Delta8-THCQ19542-59-7C21H28O3
- 3-(Allyloxy)estra-1,3,5(10)-triene-16alpha,17beta-diol10448-94-9C21H28O3
- Epoxypregn-4-ene-3,20-dione, (11beta,12beta)-1099-20-3C21H28O3
- 11,21-Dihydroxypregna-1,4,17(20)-trien-3-one, (11beta,17Z)-28449-40-3C21H28O3
- 3-(Allyloxy)estra-1,3,5(10)-triene-16beta,17beta-diol5781-42-0C21H28O3
- Levonorgestrel-4beta,5-oxide51267-67-5C21H28O3
- Viridone290308-00-8C21H28O3
- Estradiol monopropionate1323-33-7C21H28O3
- (Inverted exclamation markA)-CBCQ2415352-36-0C21H28O3
- 1 suppliersLevonorgestrel EP impurity I21508-50-9C21H28O3
- Cannabicoumaronone70474-97-4C21H28O3
- Triptohairic acid220209-71-2C21H28O3
- 14-Hydroxypregna-1,4-diene-3,20-dione97055-11-3C21H28O3
- (8'R,9'S,10'R,13'S,14'S)-10',13'-Dimethylspiro[1,3-dioxolane-2,17'-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthrene]-3'-one2398-63-2C21H28O3
- 17-Ethynyl-9,17-dihydroxyandrost-4-en-3-one116256-39-4C21H28O3
- Cyclethrin97-11-0C21H28O3
- Methyl 13-cis-4-Oxoretinoate71748-57-7C21H28O3
- 17-Hydroxypregna-1,4-diene-3,20-dione2477-61-4C21H28O3
- Levonorgestrel EP impurity G87585-03-3C21H28O3
- 1-Naphthalenol, 2,3-dibutyl-4-methoxy-, acetate123332-22-9C21H28O3
- 1-Naphthalenol, 2,6-dibutyl-4-methoxy-, acetate123332-33-2C21H28O3
- 1-Naphthalenol, 2-butyl-4-methoxy-5,6,7,8-tetramethyl-, acetate123332-34-3C21H28O3
- 1-Naphthalenol, 2,3-diethyl-4-methoxy-5,6,7,8-tetramethyl-, acetate123332-40-1C21H28O3
- 1-Naphthalenol, 6-butyl-2,3-diethyl-4-methoxy-, acetate123332-41-2C21H28O3
- 1-Naphthalenol, 8-butyl-2,3-diethyl-4-methoxy-, acetate123332-42-3C21H28O3
- 9,17-Dihydroxy-17-ethynylandrost-4-en-3-one116299-92-4C21H28O3
- Allylestriol26583-08-4C21H28O3
- 2-Cyclododecyl-6-hydroxy-4H-chromen-4-one247070-37-7C21H28O3
- (E,8S)-1,11-Bis(furan-3-yl)-4,8-dimethylundec-4-en-6-one102856-53-1C21H28O3
- 17alpha-Pregn-4-ene-3,11,20-trione26423-78-9C21H28O3
- 6alpha-(Methoxymethyl)androsta-1,4-dien-3,17-dione881896-95-3C21H28O3
- 16beta-Hydroxynorgestrel40915-03-5C21H28O3
- (4aR,10aR)-6-Methoxy-1,4a-dimethyl-7-propan-2-yl-4,9,10,10a-tetrahydro-3H-phenanthrene-2-carboxylic acidC21H28O3
- 17-Oxoandrosta-5,7-dien-3-yl acetate64110-61-8C21H28O3
- 2alpha-Hydroxylevonorgestrel40915-08-0C21H28O3
- Androsta-3,5-dien-17-one, 3-(acetyloxy)-4968-05-2C21H28O3
- 16alpha-Hydroxynorgestrel40915-07-9C21H28O3
- 17-Oxoandrosta-4,6-dien-3-yl acetate25485-36-3C21H28O3
- Cortexolone impurity A853-27-0C21H28O3
- Pregna-1,4,17(20)-trien-3-one, 11,21-dihydroxy-, (11beta)-51259-83-7C21H28O3
- 8,9-Dihydro-1-hydroxy-6,6,9-trimethyl-3-pentyl-6H-dibenzo(B,D)pyran-10(7H)-one56154-60-0C21H28O3
- 7-Oxodehydroabietic acid, methyl ester110936-78-2C21H28O3
- 2-Naphthalenecarboxylic acid, 6-(decyloxy)-122527-97-3C21H28O3
- (8'R,9'S,13'S,14'S)-3'-Methoxy-13'-methylspiro[1,3-dioxolane-2,17'-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthrene]28336-29-0C21H28O3
- 3b-O-Acetyl-androsta-5,15-dien-17-one17921-64-1C21H28O3
- 7-Oxo-delta(1)-tetrahydrocannabinol52663-85-1C21H28O3
- 6,19-Epoxypregn-4-ene-3,20-dione2205-86-9C21H28O3
- 9a,11a-Dimethyl-2,3,3a,3b,4,5,7,9a,9b,10,11,11a-dodecahydrospiro[cyclopenta[a]phenanthrene-1,2'-[1,3]dioxolan]-7-oneC21H28O3
- Pregna-4,6-diene-3,20-dione, 21-hydroxy-17916-84-6C21H28O3
- 3,5-Dimethyl-4-(3'-isopropyl-4'-methoxymethoxybenzyl)-benzyl alcohol877220-33-2C21H28O3
- 11-Hydroxypregna-4,6-diene-3,20-dione21063-87-6C21H28O3
- 4a,9,10,10a-Tetrahydro-7-methoxy-1,1,4a-trimethyl-8-(1-methylethyl)-2,4(1H,3H)-phenanthrenedione55334-48-0C21H28O3
- 1H-Cyclopenta[a]phenanthren-17-ol, 2,3,4,11,12,13,14,15,16,17-decahydro-3-methoxy-13-methyl-, acetate56771-80-3C21H28O3
- 2-(Butyl-2-methylphenoxy)-1-(2-phenylethoxy)ethanol94247-88-8C21H28O3
- [2-Methyl-4-oxo-3-[(2E)-penta-2,4-dienyl]cyclopent-2-en-1-yl] 2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropane-1-carboxylate56586-14-2C21H28O3
- 2-Ethylhexyl 2-acetyl-5-phenylpenta-2,4-dienoate87148-01-4C21H28O3
- 4-[3-(Benzyloxy)propyl]benzaldehyde diethyl acetal454678-96-7C21H28O3
- (13S,17r)-13-Ethyl-17-ethynyl-6,17-dihydroxy-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-one1458616-80-2C21H28O3
- Methyl (17beta)-3-methoxyestra-1,3,5(10)-triene-17-carboxylate3589-86-4C21H28O3
- Delta9-THCQ860480-30-4C21H28O3
- Cyclopropanecarboxylic acid, 2,2-dimethyl-3-(2-methyl-1-propenyl)-, (3-(2-methyl-1-oxopropyl)phenyl)methyl ester, (1R-trans)-128347-62-6C21H28O3
- 4-Acetyl-3,16-dimethyl-18-oxapentacyclo[13.2.1.03,7.08,17.011,16]octadec-10-en-13-one2236-20-6C21H28O3
- 3-Oxoandrosta-4,9(11)-dien-17-yl acetate33644-98-3C21H28O3
- 9,13-Dimethyl-7-oxapentacyclo[10.8.0.02,9.04,8.013,18]icos-17-ene-6,16-dione10459-00-4C21H28O3
- (2Z)-2-(11-Hydroxy-10,13-dimethyl-3-oxo-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-17-ylidene)acetaldehyde23398-09-6C21H28O3
- 4-Keto 9-cis Retinoic Acid Methyl Ester163955-59-7C21H28O3
- alpha,beta-Diethyl-4-methoxy-alpha-(4-methoxyphenyl)-benzenepropanol71526-46-0C21H28O3
Frequently asked questions
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 Pregn-4-ene-3,11,20-trione, 3-Hydroxy-2-((1R,6R)-3-methyl-6-(1-methylethenyl)-2-cyclohexen-1-yl)-5-pentyl-2,5-cyclohexadiene-1,4-dione, Pyrethrin I. 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.