InChI=1S/C21H28O7S/c1-14(7-6-8-15(2)11-21(22)23)9-10-19-16(3)17(4)20(27-5)12-18(19)13-28-29(24,25)26/h6-10,12,15H,11,13H2,1-5H3,(H,22,23)(H,24,25,26)/b8-6+,10-9+,14-7+