title: Preclinical data on STS 557. Introduction.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D009277:Nandrolone / Q000031:analogs & derivatives* / Q000494:pharmacology; D045167:Progesterone Congeners / Q000494:pharmacology*
chemical_list: D045167:Progesterone Congeners; C023635:dienogest; D009277:Nandrolone