InChI=1S/C17H14O10S/c1-22-7-4-8-11(12-14-17(25-14)26-16(12)23-8)13-9(7)5-2-3-6(27-28(19,20)21)10(5)15(18)24-13/h4,6,12,14,16-17H,2-3H2,1H3,(H,19,20,21)