ChEBI: Cyclophosphamide is a phosphorodiamide that is 1,3,2-oxazaphosphinan-2-amine 2-oxide substituted by two 2-chloroethyl groups at the amino nitrogen atom. It has a role as a carcinogenic agent, an alkylating agent, an immunosuppressive agent, an antineoplastic agent, an antirheumatic drug, an environmental contaminant, a xenobiotic and a drug allergen. It is a phosphorodiamide, a nitrogen mustard and an organochlorine compound.NCI Thesaurus (NCIt): Cyclophosphamide Anhydrous is the anhydrous form of cyclophosphamide, a synthetic nitrogen mustard alkylating agent, with antineoplastic and immunosuppressive activities. In the liver, cyclophosphamide is converted to active metabolites including phosphoramide mustard, which binds to and crosslinks DNA and RNA, thereby inhibiting DNA replication and protein synthesis. This agent, at low doses, is also a potent immunosuppressant primarily by depleting T-regulatory cells.