(5S)-1,5-Dimethylpiperazin-2-one1068149-94-9100 % similar N-Methyl-2-pyrrolidone872-50-439 % similar Sarcosine anhydride5076-82-438 % similar 1-Methyl-4-carboxy-2-pyrrolidone42346-68-938 % similar N-Methylcaprolactam2556-73-235 % similar tert-Butyl 3-methylpiperazine-1-carboxylate120737-59-932 % similar Dmpu7226-23-531 % similar