InChI=1S/C20H26O4/c1-18-8-14(22)16-12(3-5-23-16)13(18)2-4-19-7-11-6-15(17(18)19)24-20(11,9-19)10-21/h11,13,15,17,21H,2-10H2,1H3/t11?,13?,15?,17?,18-,19+,20+/m1/s1