| abstract |
The invention relates to compounds of the formula I <IMAGE> in which Z is oxygen, sulphur or the group N-R<4>, R<1>, R<2> and R<3> can be identical or different and are hydrogen, an alkyl or aralkyl group or an aromatic radical, R<4> is hydrogen or an alkyl group, and in which one or more of the radicals R<1>, R<2> and R<3> are an aromatic radical substituted by the group -O-X in which O is oxygen and X is a glycosyl, phosphate or acyl radical, process for the preparation thereof and method for detecting substances with hydrolase activity in a sample. |