Clostebol acetate Alias: 4-chlorotestosterone acetate; 4-chloroandrost-4-ene-17beta-ol-3-one acetate CAS NO.: 855-19-6 Molecular Formula: C21H29ClO3 Molecular weight: 364.91 Standard: Enterprise Standard For bodybuilding. Clostebol Acetate is basically testosterone with an added 4-chloro group in the A-ring. All it means is that it cannot properly interact with the 5-Alpha-Reductase enzyme to be 5-alpha reduced to dihydrotestosterone. Thus, hair loss and acne caused by DHT is not possible. Aromatization is also not possible, so estrogenic side effects aren't likely either. On paper Clostebol Acetate looks great and it basically has a similar anabolic: androgenic ratio to other steroids like Masteron. But I have to say that since it isn't DHT-Derived like Masteron is, it's probably not going to have some of the cool precontest physique hardening properties of Masteron and other similar compounds. To be perfectly frank, Clostebol is just a pretty weak testosterone-derived steroid. http://chemsteroids.com/ http://www.vsteroid.com/