Abiaterone-5,6-Epoxide is an impurity of Abiraterone (A108490), which is a steroidal cytochrome P 450 17α-hydroxylase-17,20-lyase inhibitor (CYP17), is currently undergoing phase II clinical trials as a potential drug for the treatment of androgen-dependent prostate cancer. Molecular Formula: C24H33NO2 Molecular Weight: 367.52