<prompt> All are alkylating agents used in chemotherapy EXCEPT:MelphalanBusulfanCladribineCyclophosphamide  <response>: Ref: KDT pg. 819-20; Katzungy 14th ed. pg. 958-961 Alkylating agents have cytotoxic and radiomimetic actions. They are mainly cell cycle non-specific, i.e. act on dividing as well as resting cells. Cross-linking of DNA appears to be of major importance to the cytotoxic action of alkylating agents, and replicating cells are most susceptible to these drugs. Drugs are:Alkylating agents- cell cycle- nonspecific agentsAntimetabolites- cell cycle- specific agentsNitrogen mustard Cyclophosphamide Ifosfamide Mechlorethamine Melphalan ChlorambucilFolic acid antagonist:MethotrexatePurine analogues 6 Mercaptopurine 6thioguanine Cladribine FludarabineDrugs acting by Methylation Procarbazine Dacarbazine TemozolomidePyrimidine analogues Capecitabin Gemcitabin Cyatarabine and 5 FUNitrosoureas Carmustine Lomustine Semustine StreptozocinMiscellaneous Busulfan Altretamine Thiotepa Trabectadin 