2,6-Piperazinedione, 4,4'-(1-methyl-1,2-ethanediyl)bis(1-methyl-, (R)- 4,4'-(1-Methyl-1,2-ethanediyl)bis(1-methyl-2,6-piperazinedione) 96886-77-0 Icrf 239 Icrf-239