InChI=1S/C21H22O10S/c1-12(17(31-32(25,26)27)11-21(2,3)20(23)24)6-8-29-19-13-4-5-18(22)30-16(13)10-15-14(19)7-9-28-15/h4-7,9-10,17H,8,11H2,1-3H3,(H,23,24)(H,25,26,27)/b12-6+