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