InChI=1S/C16H16O8S/c1-22-15-6-11-14(7-13(15)17)23-8-12(16(11)18)9-2-4-10(5-3-9)24-25(19,20)21/h2-7,12,16-18H,8H2,1H3,(H,19,20,21)