- a cytotoxic purine analog, C9H7N7O2S, used as an immunosuppressive in organ transplantations and in rheumatoid arthritis and connective tissue disorders.
- a synthetic drug that suppresses the normal immune responses of the body and is administered orally during and after organ transplantation and also in certain types of autoimmune disease. Formula: C 9 H 7 N 7 O 2 S
