title: Letter: Results of butocin (NSC-172755) testing against tumors in animals.
mesh_terms: D000818:Animals; D004353:Drug Evaluation, Preclinical; D006801:Humans; D007942:Leukemia, Experimental / Q000188:drug therapy; D015122:Mercaptopurine / Q000031:analogs & derivatives* / Q000627:therapeutic use*; D051379:Mice; D009374:Neoplasms, Experimental / Q000188:drug therapy*; D051381:Rats
chemical_list: D015122:Mercaptopurine