InChI=1S/C22H20O7S/c1-26-17-10-8-14(11-18(17)27-2)16-9-7-13-5-4-6-15-12-19(28-3)22(21(16)20(13)15)29-30(23,24)25/h4-12,22H,1-3H3,(H,23,24,25)