ACNU NIMUSTINE IS A CELL-CYCLE PHASE NONSPECIFIC ANTINEOPLASTIC BELONGING TO THE NITROSOUREA GROUP OF COMPOUNDS, WHICH ARE CONSIDERED TO FUNCTION AS ALKYLATING AGENTS.ACNU NIMUSTINE READILY CROSSES THE BLOOD-BRAIN BARRIER, APPEARING IN CEREBROSPINAL FLUID IN SUBSTANTIAL CONCENTRATIONS ALMOST IMMEDIATELY AFTER I.V. INJECTION.