InChI=1/C21H17NO4/c1-21(2)20(24)15(12-22-14-6-4-3-5-7-14)18-16(26-21)10-8-13-9-11-17(23)25-19(13)18/h3-12,22H,1-2H3/b15-12+ A691B40AAD9A3166