4-Nitrophenyl 6-O-(a-D-glucopyranosyl)-b-D-glucopyranoside is a chromogenic substrate that is used for the detection of ?-glucuronidase activity. It is a ligand that can be used to detect ?-glucuronidase and ?-galactosidase activity in culture media. This product can be used as a reagent for diagnostics, including food testing, high quality, and environmental testing. 4NPG6OBG is a fluorogenic substrate that is used as an enzyme substrate in chemiluminescence and bioluminescence reactions.