InChI=1S/C17H22O6S/c1-13(2)5-4-6-14(3)11-12-22-17(18)15-7-9-16(10-8-15)23-24(19,20)21/h5,7-11H,4,6,12H2,1-3H3,(H,19,20,21)/b14-11-