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