1 FUJ [(7-methoxy-2-oxo-2h-1-benzopyran-4-yl)methyl]phosphonic acid 1.000 2 GTV [(5,7-dimethyl-2-oxo-2h-1-benzopyran-4-yl)methyl]phosphonic acid 0.800 3 P9T [(5,7-difluoro-2-oxo-2h-1-benzopyran-4-yl)methyl]phosphonic acid 0.800 4 TWB [(6,7-dimethyl-2-oxo-2h-1-benzopyran-4-yl)methyl]phosphonic acid 0.800 5 YKG [(5-bromo-7-methyl-2-oxo-2h-1-benzopyran-4-yl)methyl]phosphonic acid 0.800 6 KED [(2-oxo-1,2-dihydroquinolin-4-yl)methyl]phosphonic acid 0.789 7 VKE [(6-oxo-2h,6h-[1,3]dioxolo[4,5-G][1]benzopyran-8-yl)methyl]phosphonic acid 0.762 8 XJE [(5-methoxy-7-methyl-2-oxo-2h-1-benzopyran-4-yl)methyl]phosphonic acid 0.762 9 T6Z [(1-methyl-2-oxo-1,2-dihydroquinolin-4-yl)methyl]phosphonic acid 0.750 10 EBF 7-methoxychromen-2-one 0.722 11 7SX [(5,7-dimethyl-2-oxo-1,2-dihydroquinolin-4-yl)methyl]phosphonic acid 0.714 12 L8J [(5,7-dibromo-2-oxo-1,2-dihydroquinolin-4-yl)methyl]phosphonic acid 0.714 13 I59 Hydroxy(1-naphthyl)methylphosphonic acid 0.700