This compound can be obtained in three different ways: 1) By ozonolysis of 3-butenyl-N,N-bis(2-chloroethyl)phosphorodiamidate (I) in aqueous acetone. 2) By the Fenton's oxidation (FeSO4, H2O2) of cyclophosphamide (II). 3) By ozonization of cyclophosphamide (II) in acetone - water.