Title: Dromostanolone
CAS Registry Number: 58-19-5
CAS Name: (2a,5a,17b)-17-Hydroxy-2-methyl-androstan-3-one
Additional Names: 17b-hydroxy-2a-methyl-5a-androstan-3-one; 2a-methylandrostan-17b-ol-3-one; 2a-methyldihydrotestosterone; drostanolone
Molecular Formula: C20H32O2
Molecular Weight: 304.47
Percent Composition: C 78.90%, H 10.59%, O 10.51%
Literature References: Synthetic estrogen antagonist. Prepn: H. J. Ringold et al., J. Am. Chem. Soc. 81, 427 (1959); H. J. Ringold, G. Rosenkranz, US 3118915 (1964 to Syntex). GC-MS determn of urinary metabolites: D. DeBoer et al., J. Steroid Biochem. Mol. Biol. 42, 411 (1992).
Properties: Crystals from acetone/hexane, mp 149-153°. [a]D +32° (ethanol).
Melting point: mp 149-153°
Optical Rotation: [a]D +32° (ethanol)
Derivative Type: Propionate
CAS Registry Number: 521-12-0
Manufacturers' Codes: NSC-12198
Trademarks: Drolban (Lilly); Emdisterone; Masterid (Grenthal); Masteril (Syntex); Masterone (Syntex); Permastril (Cassenne)
Molecular Formula: C23H36O3
Molecular Weight: 360.53
Percent Composition: C 76.62%, H 10.06%, O 13.31%
Properties: Crystals from hexane, mp 126-130°. [a]D +24°.
Melting point: mp 126-130°
Optical Rotation: [a]D +24°
NOTE: This is a controlled substance (anabolic steroid): 21 CFR, 1308.13, as defined in 1300.01.
Therap-Cat: Antineoplastic.
Keywords: Antineoplastic (Hormonal); Androgens.
Dronedarone Droperidol Droprenilamine Dropropizine Drosera

Systematic (IUPAC) name
(2R,5S,8R,9S,10S,13S,14S,17S)-17-hydroxy- 2,10,13-trimethyl-1,2,4,5,6,7,8,9,11,12,14,15,16,17- tetradecahydrocyclopenta[a]phenanthren-3-one
Clinical data
Legal status  ?
CAS number 58-19-5 YesY
ATC code None
PubChem CID 6011
Chemical data
Formula C20H32O2 
Mol. mass 304.46 g/mol
 N (what is this?)  (verify)

Drostanolone (INN; also known as dromostanolone or Drolban), marketed as Masteron, is an anabolic steroid. Drostanolone is a part of the dihydrotestosterone (DHT) family. Its main medical uses include lowering cholesterol levels and as an antineoplastic agent in the treatment of some cancers. It is most commonly marketed as the ester drostanolone propionate (trade name Masteron). Drostanolone has been used for bodybuilding, mainly in "cutting cycles."