1,4-benzenedicarboxaldehyde, 2,5-dihydroxy-3,6-dipropyl- 2,5-dihydroxy-3,6-dipropylterephthalaldehyde InChI=1/C14H18O4/c1-3-5-9-11(7-15)14(18)10(6-4-2)12(8-16)13(9)17/h7-8,17-18H,3-6H2,1-2H