次黄嘌呤的抗代谢药。抗肿瘤剂。;An antimetabolite of hypoxanthine. Antitumor agent.;不溶于水,溶于稀碱溶液,微溶于稀硫酸,溶于热乙醇,不溶于丙酮和醚。;6-Mercaptopurine is a widely used antileukemic agent that inhibits de novo purine synthesis through incorporation of thiopurine methyltransferase metabolites into DNA and RNA.