1506-47-4 2,6-Piperazinedione, 4,4'-(1,2-ethanediyl)bis- 2,6-Piperazinedione, 4,4'-ethylenedi- Glycine, N,N'-1,2-ethanediylbis(N-carboxymethyl)-, N,N:N',N'-diimide NSC129942