2,5-Dimethyl-1,4-dinitrosopiperazine 2,5-Dimethyl-dnpz 2,5-Dimethyldinitrosopiperazine 55556-88-2 Dinitroso-2,5-dimethylpiperazine NSC 86956 PIPERAZINE, 2,5-DIMETHYL-1,4-DINITROSO-