four classes of directly acting cytostatic drugs were studied : nitrogen mustards ( nitrogen mustard , melphalan , chlorambucil and phosphoramide mustard , a metabolite of cyclophosphamide ) , ethyleneimine derivatives ( thio-tepa , tepa and triethylenemelamine ) , busulfan , and halogenated nitrosoureas .
C0028165
nitrogen mustards
C0008163
chlorambucil