2,17a-methyl-5a-androsta-1-en-17b-ol-3-one (Methylstenbolone)
An active and orally-bioavailable compound engineered to resist metabolic breakdown on both the A and D rings, precisely where other active hormonal molecules typically degrade into estrogenic or biologically-inactive metabolites.
Claims: Sperior pharmacokinetic profile and exceptional potency; does not aromatize into any estrogenic compound and has no affinity for the progesterone receptor, so estrogen and progesterone receptor mediated side effects are of no concern.
AKA methyl stenbolone, methyl sten, 17a-methyl-stenbolone,
Just a quick reference.