(1,4'-Bipiperidine)-1',4'-dicarboxamide, N(sup 1'),N(sup 1''')-1,2-ethanediylbis(N(sup 1')-butyl- 40958-73-4 BRN 0469784 N,N'-Dibutyl-N,N'-bis((4-piperidino-4-carbamoyl)piperidinocarbonyl)ethylenediamine