Primobolan Methenolone Acetate Basic Info CAS Number: 434-05-9 Molecular formula: C22H32O3 Molecular Weight: 344.49 Appearance: White or Almost white crystalline powder Grade: Pharmaceutical Grade What is Methenolone Acetate ? Metenolone acetate, or methenolone acetate (brand names Primobolan, Primobolan S, Primonabol, Nibal), also known as 1-methyl-4,5α-dihydro-δ1-testosterone 17β-acetate (1-methyl-δ1-DHT 17β-acetate) or 1-methylandrost-1,4-dien-17β-ol-3-one 17β-acetate, is a synthetic, orally active anabolic-androgenic steroid (AAS) and derivative of …