17-?(3-?Pyridinyl)?-androst-?4-?en-?3-?one is an impurity of Abiraterone (A108490) 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. (3-Keto Abiraterone Impurity 1).
