InChI=1S/C21H20O12/c22-6-12(27)19-16(29)17(30)21(32-19)33-20-15(28)14-11(26)4-8(23)5-13(14)31-18(20)7-1-2-9(24)10(25)3-7/h1-5,12,16-17,19,21-27,29-30H,6H2/t12-,16-,17-,19-,21+/m1/s1