what are antimetabolites
antimetabolite anÂ·tiÂ·meÂ·tabÂ·oÂ·lite (Än'tÄ-mÄ­-tÄb'É-lÄ«t', Än'tÄ«-) n. A substance that closely resembles an essential metabolite and competes with, interferes with, or replaces the metabolite in physiological reactions.