InChI=1S/C21H20O11/c22-7-14-17(27)18(28)19(29)21(32-14)31-13-5-10-12(6-11(24)16(26)15(10)25)30-20(13)8-1-3-9(23)4-2-8/h1-6,14,17-19,21-22,27-29H,7H2,(H3-,23,24,25,26)/p+1/t14-,17-,18+,19-,21-/m1/s1