InChI=1S/C11H14O7S/c1-11(8-17-11)9(18-19(14,15)16)6-4-2-3-5-7-10(12)13/h2-7,9H,8H2,1H3,(H,12,13)(H,14,15,16)/b3-2-,6-4+,7-5+