InChI=1S/C11H14O7S/c12-9(3-6-11(13)14)7-8-1-4-10(5-2-8)18-19(15,16)17/h1-2,4-5,9,12H,3,6-7H2,(H,13,14)(H,15,16,17)/t9-/m1/s1