1155-54-0 2,6-Piperazinedione, 4,4'-(1,2-ethanediyl)bis(1-methyl- (9CI) 2,6-Piperazinedione, 4,4'-ethylenebis(1-methyl- 4,4'-Ethylenebis(1-methyl-2,6-piperazinedione) Icrf 158 NSC 134697