| 摘要 |
<p>The invention provides compounds represented by formula (I) and their salts, wherein R<1> represents C1-C5 alkylene, R<2> and R<3>, which may be the same or different, each represents hydrogen, C1-C5 alkyl, C1-C5 alkyloxy, amino, mono- or di-(C1-C5 alkyl)amino (provided that R<2> and R<3> do not represent hydrogen at the same time) or, when taken together, represent C1-C5 alkylenedioxy, and R<4> represents hydrogen or C1-C5 alkyl. Since the compounds react with a carboxylic acid in a short time at room temperature in the presence of a condensing agent to produce amides emitting strong fluorescence, thus being useful as reagents for determining carboxylic acids rapidly with high sensitivity.</p> |
