InChI=1S/C20H18O11S/c1-20(2)19(31-32(26,27)28)17(25)10-3-8(4-13(23)18(10)30-20)11-7-29-14-6-9(21)5-12(22)15(14)16(11)24/h3-7,17,19,21-23,25H,1-2H3,(H,26,27,28)