An alkylating chloroethylnitrosourea with antineoplastic activity. Selectively accumulating in some tumor cells, SarCNU forms covalent linkages with nucleophilic centers in DNA, causing depurination, base pair miscoding, strand scission, and DNA-DNA cross-linking, which may result in cytotoxicity. or A substance being studied in the treatment of cancer. It is a type of alkylating agent. Also called sarcosinamide nitrosourea.