InChI=1S/C18H16O10S/c1-2-4-9-11-12(13(20)7-5-3-6-8(19)10(7)14(11)21)15-16(26-9)17(18(22)27-15)28-29(23,24)25/h3,5-6,9,15-17,19H,2,4H2,1H3,(H,23,24,25)