ChEBI: Abiraterone acetate is a sterol ester obtained by formal condensation of the 3-hydroxy group of abiraterone with the carboxy group of acetic acid. A prodrug that is converted in vivo into abiraterone. Used for treatment of metastatic castrate-resistant prostate cancer. It has a role as a prodrug, an antineoplastic agent and an EC 1.14.99.9 (steroid 17alpha-monooxygenase) inhibitor. It is a sterol ester and a member of pyridines. It derives from an abiraterone.NCI Thesaurus (NCIt): Abiraterone Acetate is an orally active acetate ester form of the steroidal compound abiraterone with antiandrogen activity. Abiraterone inhibits the enzymatic activity of steroid 17alpha-monooxygenase (17alpha-hydrolase/C17,20 lyase complex), a member of the cytochrome p450 family that catalyzes the 17alpha-hydroxylation of steroid intermediates involved in testosterone synthesis. Administration of this agent may suppress testosterone production by both the testes and the adrenals to castrate-range levels.