1,4-Butanediamine,N'-(decahydro-3,6,9-trimethyl-6,9-epoxy-3a,7-methano-3aH-cyclopentacycloocten-8-yl)-N-[3-(dimethylamino)propyl]-N-methyl-,[3R-(3a,3ab,6a,7b,8b,9a,9ab)]-