4H-1-benzopyran-4-one, 7-hydroxy-3-(2-pyridinyl)- 7-hydroxy-3-pyridin-2-yl-4H-chromen-4-one InChI=1/C14H9NO3/c16-9-4-5-10-13(7-9)18-8-11(14(10)17)12-3-1-2-6-15-12/h1-8,16