1,1'-propane-2,2-diylbis(3,4-dimethoxybenzene) InChI=1/C19H24O4/c1-19(2,13-7-9-15(20-3)17(11-13)22-5)14-8-10-16(21-4)18(12-14)23-6/h7-12H,1-6H benzene, 1,1'-(1-methylethylidene)bis[3,4-dimethoxy-