| 摘要 |
The invention relates to novel aromatic acids, especially to compounds of formula <IMAGE> (I) wherein R1 is lower alkyl, R2 is lower alkyl, R3 is hydrogen, carboxy or sulfo, R4 is carboxy or sulfo, G is an unsubstituted or substituted 1,4-phenylene group or an unsubstituted or substituted 1,4-naphthylene group, and wherein either R5 and R6 together are an additional bond and L is an oxygen or sulfur atom or wherein R5 is hydrogen, R6 is halomethyl and L is an oxygen atom, and salts thereof, to the use of compounds I and their salts, to a process for the preparation of compounds I and their salts, to starting materials used in that preparation process, and salts thereof, to a process for the preparation of those starting materials and their salts, to a device in which the compounds I and their salts are used, and to a process in which that device is used. The compounds of formula I can be used as adjuncts in the investigation of proteins and can be prepared in a manner known per se.
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