InChI=1S/C21H20O12/c22-6-14-17(28)18(29)19(30)21(33-14)32-13-4-8-12(5-11(25)16(27)15(8)26)31-20(13)7-1-2-9(23)10(24)3-7/h1-5,14,17-19,21-22,28-30H,6H2,(H4-,23,24,25,26,27)/p+1/t14-,17-,18+,19-,21-/m1/s1