InChI=1S/C21H20O9/c1-10-5-12(22)8-15(23)18(10)20(27)30-19-14-9-29-13(3-4-17(25)26)6-11(14)7-16(24)21(19,2)28/h3-8,14,19,22-23,28H,9H2,1-2H3,(H,25,26)/b4-3+/t14-,19+,21+/m1/s1