Title: Boldenone
CAS Registry Number: 846-48-0
CAS Name: (17b)-17-Hydroxyandrosta-1,4-dien-3-one
Additional Names: 1,4-androstadien-17b-ol-3-one; 3-oxo-17b-hydroxy-1,4-androstadiene; dehydrotestosterone
Molecular Formula: C19H26O2
Molecular Weight: 286.41
Percent Composition: C 79.68%, H 9.15%, O 11.17%
Literature References: Anabolic steroid. Prepn: Meystre et al., Helv. Chim. Acta 39, 734 (1956); Florey, US 2875196 (1949 to Olin Mathieson); Nobile, US 2837464 (1958 to Schering). Metabolism in humans and GC/MS determn in urine: W. Schänzer, M. Donike, Biol. Mass Spectrom. 21, 3 (1992). LC/MS determn in horse urine: F. Pu et al., J. Chromatogr. B 813, 241 (2004). Review of metabolism in animal species: H. F. De Brabander et al., Food Addit. Contam. 21, 515-525 (2004).
Properties: Crystals, mp 164-166°. [a]D25 +25° (in chloroform).
Melting point: mp 164-166°
Optical Rotation: [a]D25 +25° (in chloroform)
Derivative Type: Acetate
Molecular Formula: C21H28O3
Molecular Weight: 328.45
Percent Composition: C 76.79%, H 8.59%, O 14.61%
Properties: Crystals, mp 151-153°.
Melting point: mp 151-153°
Derivative Type: 10-Undecenoate
CAS Registry Number: 13103-34-9
Additional Names: Boldenone undecylenate
Manufacturers' Codes: Ba-29038
Trademarks: Equipoise (Fort Dodge); Parenabol
Molecular Formula: C30H44O3
Molecular Weight: 452.67
Percent Composition: C 79.60%, H 9.80%, O 10.60%
NOTE: This is a controlled substance (anabolic steroid): 21 CFR, 1308.13, as defined in 1300.01.
Therap-Cat-Vet: Anabolic.
Boldine Boldo Bole, Armenian Boleko Oil Bombesin

Systematic (IUPAC) name
(8R,9S,10R,13S,14S,17S)-17-hydroxy-10,13-dimethyl-6,7,8,9,10,11, 12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-3-one
Clinical data
AHFS/ International Drug Names
Pregnancy cat. X (US)
Legal status Schedule III (US)
Routes Intramuscular
Pharmacokinetic data
Half-life 14 days
CAS number 846-48-0 YesY
ATC code None
PubChem CID 13308
DrugBank DB01541
ChemSpider 12744 YesY
ChEBI CHEBI:34584 YesY
Chemical data
Formula C19H26O2 
Mol. mass 286.409 g/mol
Physical data
Melt. point 165 °C (329 °F)
 YesY (what is this?)  (verify)

Boldenone (1,4-androstadiene-3-one-17β-ol, available as the undecylenate ester), also known under the trade names Equipoise, Ganabol, Equigan and Ultragan, is an anabolic steroid developed for veterinary use, mostly for treatment of horses. In the US it is not indicated for use in humans and is only available through veterinary clinics.