3,3'-(Tetramethylenediimino)dipropionaldehyde dihydrochloride 38770-24-0 4,9-Diazadodecanedialdehyde dihydrochloride Propanal, 3,3'-(1,4-butanediyldiimino)bis-, dihydrochloride Propionaldehyde, 3,3'-(tetramethylenediimino)di-, dihydrochloride