This invention provides .beta.-D-Glucuronidase substrates of the formula: ##STR1## wherein R.sub.1, R.sub.2, and R.sub.7 -R.sub.12 are independently selected from the group consisting of: hydrogen, fluorine, chlorine, bromine, iodine, alkyl, hydroxyl, alkoxy, carboxyl and nitro groups; R.sub.3 -R.sub.6 are independently selected from the group consisting of hydrogen, fluorine, chlorine, bromine, iodine, nitro and amino; and M.sup.+ is selected from the group consisting of: proton, lithium, sodium, potassium, magnesium, calcium, barium, and ammonium ion.

Cette invention fournit des substrats de beta.-D-Glucuronidase de la formule : ## du ## STR1 où R.sub.1, R.sub.2, et R.sub.7 - R.sub.12 sont indépendamment choisis dans le groupe : groupes nitro d'hydrogène, de fluor, de chlore, de brome, d'iode, d'alkyl, d'hydroxyle, alcoxy, carboxyliques et ; R.sub.3 - R.sub.6 sont indépendamment choisis dans le groupe l'hydrogène , fluor, chlore, brome, iode, nitro et aminé ; et M.sup.+ est choisi dans le groupe : proton, lithium, sodium, potassium, magnésium, calcium, baryum, et ion d'ammonium.

 
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