Turinabol (Tbol, 4 Chlorodehydromethyltestosterone) also known as tbol, oral tbol, oral turinabol and chlorodehydromethyltestosterone is an oral steroid. The chemical name of turinabol is 4-Chlorodehydromethyltestosterone, from this chemical name you can understand that turinabol is combination of the chemical structures of Dianabol (Methandienone) and Clostebol (4-chlorotestosterone). Basically turinabol is a modified form of Dianabol (Methandienone), in composition attended atom of chloro and double bond between carbon 1 and 2. This small change inhibits the hormone from aromatizing into estrogen, and also reduces its androgenic nature.