InChI=1S/C18H20O7S/c1-10-16(19)11(2)18-15(17(10)23-3)14(25-26(20,21)22)9-13(24-18)12-7-5-4-6-8-12/h4-8,13-14,19H,9H2,1-3H3,(H,20,21,22)