Injectable Steroid

Methenolone Enanthate

CAS 303-42-4
Formula C₂₇H₄₂O₃
Half-life 10.5 days (IM)
Detection 5 weeks

Chemical Identity

CAS Number	`303-42-4`
IUPAC Name	[(8R,9S,10R,13S,14S,17S)-1-methyl-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl] heptanoate
Molecular Formula	C₂₇H₄₂O₃
Molecular Weight	414.63 g/mol
SMILES	`CCCCCCC(=O)O[C@@H]1CC[C@@H]2[C@H]3CCC4=CC(=O)C(C)C[C@]4(C)[C@@H]3CC[C@]12C`
InChIKey	`FAABOBBCGPMISQ-BTQNVEKASA-N`
Melting Point	Oil (liquid at RT) °C
Solubility	Insoluble in water; soluble in oils, ethanol
Half-life	10.5 days (IM)

Pharmacological Profile

Anabolic Rating	88
Androgenic Rating	44
Aromatisation	None
Hepatotoxicity	None
Detection Window	5 weeks

Known trade names

Primobolan Depot
Primobol
Nibal Injection

Cycles using this compound

Recomp Protocol — Test E + Primobolan + Anavar

External references

Data sourced from peer-reviewed pharmacological literature and authoritative chemical databases (PubChem, DrugBank, ChEBI). Provided for identification and research reference only — not medical advice.