InChI=1S/C19H24O8S/c1-13(4-8-17(19(2,3)21)27-28(22,23)24)10-11-25-15-7-5-14-6-9-18(20)26-16(14)12-15/h5-7,9-10,12,17,21H,4,8,11H2,1-3H3,(H,22,23,24)/b13-10+