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