InChI=1S/C20H26O4/c1-12-11-15-16-19(2,8-4-9-20(16,3)18(22)24-15)14(12)6-5-13-7-10-23-17(13)21/h7,11,14-16H,4-6,8-10H2,1-3H3/t14-,15-,16+,19+,20-/m0/s1