InChI=1S/C22H18O8/c23-13-4-1-11(2-5-13)22(28)30-20-10-15-17(26)8-14(24)9-19(15)29-21(20)12-3-6-16(25)18(27)7-12/h1-9,20-21,23-27H,10H2/t20-,21-/m1/s1