InChI=1S/C20H26O4/c1-12-4-5-14-15(6-7-17(21)19(14,2)3)20(12)10-16(24-18(20)22)13-8-9-23-11-13/h5,8-9,11-12,15-17,21H,4,6-7,10H2,1-3H3/t12-,15+,16+,17-,20-/m1/s1