InChI=1S/C20H26O4/c1-24-20-13-16(9-12-19(20)23)8-11-18(22)14-17(21)10-7-15-5-3-2-4-6-15/h2-6,9,12-13,17-18,21-23H,7-8,10-11,14H2,1H3/t17-,18+/m1/s1