1,1'-(1,2-Cyclopropanediyl)bis(2,6-piperazinedione) 2,6-Piperazinedione, 1,1'-(1,2-cyclopropanediyl)bis-, trans- 62490-99-7 trans-1,1'-(1,2-Cyclopropanediyl)bis-2,6-piperazinedione trans-4,4'-(1,2-Cyclopropandiyl)bis(2,6-piperazinedione)