InChI=1S/C28H30O4/c1-3-11-28(30)12-10-23-21-7-4-17-13-19(29)6-8-20(17)26(21)22(15-27(23,28)2)18-5-9-24-25(14-18)32-16-31-24/h5,9,13-14,21-23,30H,4,6-8,10,12,15-16H2,1-2H3/t21-,22+,23-,27-,28-/m0/s1