InChI=1S/C28H30O4/c1-2-3-4-5-6-12-20-31-27(29)23-16-13-17-24(21-23)28(30)32-26-19-11-10-18-25(26)22-14-8-7-9-15-22/h7-11,13-19,21H,2-6,12,20H2,1H3