InChI=1S/C21H20O15S/c22-5-14-17(28)21(36-37(31,32)33)19(30)20(35-14)16-11(27)4-13-15(18(16)29)10(26)3-12(34-13)6-1-8(24)9(25)2-7(6)23/h1-4,14,17,19-25,27-30H,5H2,(H,31,32,33)