InChI=1S/C19H20O10S/c1-4-10(2)18(21)29-16-14-12(7-5-11-6-8-13(20)28-15(11)14)27-17(16)19(3,22)9-26-30(23,24)25/h4-8,16-17,22H,9H2,1-3H3,(H,23,24,25)/b10-4+