4-Fluoro-2-nitrophenyl b-D-galactopyranoside is a chromogenic substrate for the 4-fluoro-2-nitrophenol reductase enzyme. It is used for food testing, staining, and diagnostics. This product can be used in various applications such as bioluminescence, chemiluminescence, and enzyme substrates. 4-Fluoro-2-nitrophenyl b-D-galactopyranoside is an excellent ligand with high purity and high quality. It has been conjugated to many different molecules for use in research applications.