InChI=1S/C20H26O4/c1-6-18(4)14(22)9-13-19(5)10-11(21)15(23)17(2,3)12(19)7-8-20(13)16(18)24-20/h6,9,12,15-16,23H,1,7-8,10H2,2-5H3