Abiraterone N-Oxide Sulfate Sodium Salt-D4 is derived from Abiraterone Acetate-d4 (A108502), which is a labeled Abiraterone Acetate and is a novel steroidal inhibitor of human Cytochrome P450(17α-Hydroxylase-C17,20-lyase): potential agent for the treatment of prostatic cancer. Also it is deuterated form of Abiraterone N-Oxide Sulfate Sodium Salt (A108520), which is an analogue of Abiraterone (A108490)