InChI=1S/C16H14O10S/c1-6-10(18)13(21)11(19)9-12(20)16(26-27(22,23)24)15(25-14(6)9)7-2-4-8(17)5-3-7/h2-5,15-19,21H,1H3,(H,22,23,24)