has role has parent hydride independent continuant 3beta-hydroxy-Delta(5)-steroid pyridines 3beta-sterol androstane antineoplastic agent androgen EC 1.14.99.9 (steroid 17alpha-monooxygenase) inhibitor abiraterone CHEBI:68642 A 3β-sterol that is androsta-5,16-dien-3β-ol substituted at position 17 by a 3-pyridyl group. Administered as the <em>O</em>-acetate, it is used for treatment of metastatic castrate-resistant prostate cancer.