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