InChI=1S/C21H18O15/c22-4-1-6(23)9-7(2-4)34-18(15(29)12(9)26)5-3-8(11(25)13(27)10(5)24)35-21-17(31)14(28)16(30)19(36-21)20(32)33/h1-3,14,16-17,19,21-25,27-31H,(H,32,33)