131636-51-6 31645-39-3 IPAM Ifosfamide mustard Ifosforamide mustard Isophosphamide mustard Isophosphoramide mustard N,N'-Di-(2-chloroethyl)phosphorodiamidic acid N1,N2-Bis(2-chloroethyl)phosphoric acid diamide NSC 297900 Phosphorodiamidic acid, N,N'-bis(2-chloroethyl)-