InChI=1S/C25H28O4/c1-16(2)5-8-19-13-18(14-20(25(19)29)9-6-17(3)4)7-12-23(27)22-11-10-21(26)15-24(22)28/h5-7,10-15,26,28-29H,8-9H2,1-4H3/b12-7+