InChI=1S/C17H18O8S/c1-17(2)6-5-11-13(25-17)9-12(18)15-10(8-14(19)24-16(11)15)4-3-7-23-26(20,21)22/h5-6,8-9,18H,3-4,7H2,1-2H3,(H,20,21,22)