InChI=1S/C24H28O4/c1-13(2)5-8-17-16-10-7-15-11-20(25)21(26)12-19(15)22(16)24(28)18(23(17)27)9-6-14(3)4/h5-6,11-12,25-28H,7-10H2,1-4H3