InChI=1S/C28H36O4/c1-16(18(3)26(31)32)8-9-17(2)19-10-11-20-25-21(12-14-28(19,20)5)27(4)13-6-7-23(29)22(27)15-24(25)30/h6-9,15-19,21H,10-14H2,1-5H3,(H,31,32)/b9-8+/t16?,17-,18?,19-,21+,27-,28-/m1/s1