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|Noun||1.||Purinethol - a drug (trade name Purinethol) that interferes with the metabolism of purine and is used to treat acute lymphocytic leukemia|
antimetabolite - an antineoplastic drug that inhibits the utilization of a metabolite
immune suppressant drug, immunosuppressant, immunosuppressive, immunosuppressive drug, immunosuppressor - a drug that lowers the body's normal immune response