This is a partial list of molecules that contain 21 carbon atoms.
| Chemical formula | Synonyms | CAS number |
|---|---|---|
| C21H15N | triphenylacrylonitrile | 6304-33-2 |
| C21H16 | triphenylcyclopropene | 16510-49-9 |
| C21H18N2 | hydrobenzamide | 92-29-5 |
| C21H18NO4 | chelerythrine | 34316-15-9 |
| C21H18O11 | Baicalin | 21967-41-9 |
| C21H18O12 | Several molecules | 27740-01-8 |
| C21H20Cl2O3 | permethrin | 52645-53-1 |
| C21H20O6 | curcumin | 458-37-7 |
| C21H20O9 | Several molecules | - |
| C21H20O10 | Several molecules | - |
| C21H20O11 | Several molecules | - |
| C21H20O12 | Several molecules | - |
| C21H21N | cyproheptadine | 129-03-3 |
| C21H21NO6 | hydrastine | 118-08-1 |
| C21H21N3O7 | cacotheline | 561-20-6 |
| C21H21O4P | tricresyl phosphate | 78-30-8 |
| C21H21O4P | tricresyl phosphate | 73299-28-2 |
| C21H21O11 | Several molecules | 7084-24-4 |
| C21H21O12 | Myrtillin | 6906-38-3 |
| C21H22 | methyldodecahedrane | 82400-17-7 |
| C21H22N2O2 | strychnine | 57-24-9 |
| C21H22O8 | Nobiletin | 478-01-3 |
| C21H22O9 | Several molecules | - |
| C21H22O11 | Several molecules | - |
| C21H22O12 | Several molecules | - |
| C21H23ClFNO2 | haloperidol | 52-86-8 |
| C21H23ClFN3O | flurazepam | 17617-23-1 |
| C21H23NO | dapoxetine | 119356-77-3 |
| C21H23NO6 | colchiceine | 102491-69-0 |
| C21H23N3OS | pericyazine | 2622-26-6 |
| C21H24ClNO5 | morclofone | 31848-01-8 |
| C21H24ClN3OS | pipamazine | 84-04-8 |
| C21H24ClN3O3 | fominoben | 18053-31-1 |
| C21H24F3N3S | trifluoperazine | 117-89-5 |
| C21H24GeSn | trimethylgermanyltriphenyltin | 20213-95-0 |
| C21H24N2O3 | ajmalicine | 483-04-5 |
| C21H25NO | benztropine | 86-13-5 |
| C21H25NO | octyloxycyanobiphenyl | 52364-73-5 |
| C21H25NO2 | piperidolate | 82-98-4 |
| C21H25NO3 | piperilate | 4546-39-8 |
| C21H26ClNO | clemastine | 15686-51-8 |
| C21H26ClN3OS | perphenazine | 58-39-9 |
| C21H26N2O | acetyl fentanyl | 3258-84-2 |
| C21H26N2OS2 | mesoridazine | 5588-33-0 |
| C21H26N2O2S2 | sulforidazine | 14759-06-9 |
| C21H26N2O3 | epivincamine | 6835-99-0 |
| C21H26N2O3 | vincamine | 1617-90-9 |
| C21H26N2O3 | yohimbine | 146-48-5 |
| C21H26O2 | cannabinol | 521-35-7 |
| C21H26O2 | mestranol | 72-33-3 |
| C21H26O3 | octabenzone | 1843-05-6 |
| C21H26O5 | prednisone | 53-03-2 |
| C21H27ClN2O2 | hydroxyzine base | 68-88-2 |
| C21H27NO | diphenidol | 972-02-1 |
| C21H27NO | quinolinimide | 466-40-0 |
| C21H27NO2 | etafenone | 90-54-0 |
| C21H27NO2 | norpropoxyphene | 66796-40-5 |
| C21H27NO4 | laudanosine | 20412-65-1 |
| C21H27NO4S | diphemanil metilsulfate | 62-97-5 |
| C21H27N3O2 | methysergide | 361-37-5 |
| C21H28NO7 | clivorine | 33979-15-6 |
| C21H28N2O | diampromide | 552-25-0 |
| C21H28N2O5 | trimethobenzamide | 138-56-7 |
| C21H28O2 | ethisterone | 434-03-7 |
| C21H28O2 | ethisterone | 17554-63-1 |
| C21H28O5 | aldosterone | 52-39-1 |
| C21H28O5 | cortisone | 53-06-5 |
| C21H28BrNO4 | cimetropium bromide | 51598-60-8 |
| C21H29NO | alphamethadol | 17199-54-1 |
| C21H29NO | biperiden | 514-65-8 |
| C21H29NO7 | neoligularidine | 90364-91-3 |
| C21H29NO8 | florosenine | 16958-30-8 |
| C21H29NS2 | captodiame | 486-17-9 |
| C21H29N3O | disopyramide | 3737-09-5 |
| C21H30ClNO8 | doronine | 60367-00-2 |
| C21H30CrO3 | hexaethylbenzenechromium tricarbonyl | 47378-46-1 |
| C21H30FN3O2 | pipamperone | 1893-33-0 |
| C21H30O2 | cannabidiol | 521-37-9 |
| C21H30O2 | progesterone | 57-83-0 |
| C21H30O2 | tetrahydrocannabinol | 56282-24-7 |
| C21H30O3 | deoxycorticosterone | 64-85-7 |
| C21H30O5 | hydrocortisone | 50-23-7 |
| C21H31ClN2O | viminol | 21363-18-8 |
| C21H31NO2 | bornaprine | 20448-86-6 |
| C21H31NO4 | furethidine | 2385-81-1 |
| C21H32N2O | stanozolol | 10418-03-8 |
| C21H32O2 | bolasterone | 1605-89-6 |
| C21H32O2 | calusterone | 17021-26-0 |
| C21H32O2 | hexahydrocannabinol | 6692-85-9 |
| C21H32O2 | methyl isopimarate | 1686-62-0 |
| C21H32O2 | methyl levopimarate | 3513-69-7 |
| C21H32O2 | methyl neoabietate | 3310-97-2 |
| C21H32O2 | methyl pimarate | 3730-56-1 |
| C21H32O2 | methyl sandaracopimarate | 1686-54-0 |
| C21H32O3 | androsterone acetate | 1482-78-6 |
| C21H32O3 | oxymetholone | 434-07-1 |
| C21H32O4 | decyl benzyl succinate | 119450-18-9 |
| C21H36O5 | cortol | 516-38-1 |
| C21H38ClN | cetylpyridinium chloride | 123-03-5 |
| C21H38BrN | benzododecinium bromide | 7281-04-1 |
| C21H38O2 | isopropyl linoleate | 22882-95-7 |
| C21H38O6 | tricaproin | 621-70-5 |
| C21H39NO2Si2 | phenylalanine ditbdms | 107715-95-7 |
| C21H40 | 4-nonylbicyclohexyl | 95135-87-8 |
| C21H40O2 | octadecyl acrylate | 4813-57-4 |
| C21H40O4 | mono olein | 111-03-5 |
| C21H40O5 | glyceryl monoricinoleate | 1323-38-2 |
| C21H41N | henicosanenitrile | 66326-13-4 |
| C21H42 | cycloheneicosane | 296-78-6 |
| C21H42O2 | eicosyl methanoate | 66326-15-6 |
| C21H42O2 | ethyl nonadecanoate | 18281-04-4 |
| C21H42O2 | heneicosanoic acid | 2363-71-5 |
| C21H42O2 | isopropyl stearate | 112-10-7 |
| C21H44BrNO2 | Carbethopendecinium bromide | 10567-02-9 |
| C21H46N2 | duomeen o | 4253-76-3 |
| C21H46O3Si | octadecyltrimethoxysilane | 3069-42-9 |
| C21H49NO2SSi3 | cystein tritbdms | 110024-94-7 |
| C21H50O3Si3 | glycerol tritbdms | 82112-23-0 |