InChI=1S/C20H28O7S/c1-7-13-18-14(11(4)5)9-15(26-16(21)8-10(2)3)12(6)17(18)20(19(13)22)27-28(23,24)25/h7-8,11,14-15,17-18,20H,6,9H2,1-5H3,(H,23,24,25)/b13-7-