InChI=1S/C21H20O11S/c1-29-15-8-12(23)16-11(22)7-14(10-5-3-2-4-6-10)31-20(16)17(15)21-18(25)19(13(24)9-30-21)32-33(26,27)28/h2-8,13,18-19,21,23-25H,9H2,1H3,(H,26,27,28)