InChI=1S/C17H22O5S/c1-3-5-6-11-14-17(22-23(19,20)21)15-12-9-7-8-10-13-16(18)4-2/h4,12,15,17H,2-3,5-6,9,11,14H2,1H3,(H,19,20,21)/b15-12+