1	5JW	{[(2,7-dichloro-9h-fluoren-9-ylidene)amino]oxy}acetic acid	1.000
2	ES8	[(9h-fluoren-9-ylideneamino)oxy]acetic acid	0.905
3	L32	{[(2,7-dibromo-9h-fluoren-9-ylidene)amino]oxy}acetic acid	0.826
4	7BD	3-[(9h-fluoren-9-ylideneamino)oxy]propanoic acid	0.708