InChI=1S/C20H26O4/c1-10(2)14-16(22)11-6-7-12-19(3,4)13(21)8-9-20(12,5)15(11)18(24)17(14)23/h10,12,23H,6-9H2,1-5H3/t12-,20-/m0/s1