Multiple choice Busulfan is a well known anticancer agent. Its mode of action is alkylating agent Chain-terminator Intercalator Demethylating agent, 5-azacytidine Maturation inhibitors Reveal answer Fill a bubble to check yourself A Correct answer Explanation Busulfan acts as an alkylating agent. It contains two sulfonyloxy groups, which acts as good leaving groups when the drug reacts with a nucleophile.