1,1'-methylenebis(3-methylpiperidine) InChI=1/C13H26N2/c1-12-5-3-7-14(9-12)11-15-8-4-6-13(2)10-15/h12-13H,3-11H2,1-2H piperidine, 1,1'-methylenebis[3-methyl-