1-Methylpiperazine 109-01-3 4-Methylpiperazine 5-23-01-00082 (Beilstein Handbook Reference) AI3-25360 BRN 0102724 CCRIS 6686 EINECS 203-639-5 N-Methylpiperazine NSC 30195 PIPERAZINE, 1-METHYL-