1,4-benzenedicarboxaldehyde, 2,5-dimethoxy-3,6-dipropyl- 2,5-dimethoxy-3,6-dipropylterephthalaldehyde InChI=1/C16H22O4/c1-5-7-11-13(9-17)16(20-4)12(8-6-2)14(10-18)15(11)19-3/h9-10H,5-8H2,1-4H