InChI=1S/C17H18O5S/c1-23(21,22)14-9-7-12(8-10-14)15(11-18)16(17(19)20)13-5-3-2-4-6-13/h2-10,15-16,18H,11H2,1H3,(H,19,20)/t15-,16-/m1/s1