InChI=1S/C17H16O10S/c1-25-11-3-2-8(5-12(11)27-28(22,23)24)4-9-7-26-13-6-10(18)16(20)17(21)14(13)15(9)19/h2-3,5-6,9,18,20-21H,4,7H2,1H3,(H,22,23,24)