InChI=1S/C13H19NO4S/c1-7(4-10-6-19-9(3)14-10)11(15)5-12(16)8(2)13(17)18/h4,6,8,11-12,15-16H,5H2,1-3H3,(H,17,18)/b7-4+/t8-,11-,12+/m1/s1