2(1H)-quinolinone, 3-benzoyl-4-hydroxy- 3-benzoyl-4-hydroxyquinolin-2(1H)-one InChI=1/C16H11NO3/c18-14(10-6-2-1-3-7-10)13-15(19)11-8-4-5-9-12(11)17-16(13)20/h1-9H,(H2,17,19,20