InChI=1S/C24H19NO7/c1-31-15-10-21(32-22(29)11-15)17(7-13-5-3-2-4-6-13)25-18-12-20(28)23-16(24(18)30)8-14(26)9-19(23)27/h2-6,8-12,17,25-27H,7H2,1H3