InChI=1S/C28H30O3/c1-3-5-11-21(4-2)20-31-28(30)26-15-10-9-14-25(26)27(29)24-18-16-23(17-19-24)22-12-7-6-8-13-22/h6-10,12-19,21H,3-5,11,20H2,1-2H3