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US06004988A Carboxylic acid derivatives, their preparation and their use 失效
羧酸衍生物,其制备及其应用

Carboxylic acid derivatives, their preparation and their use
摘要:
Carboxylic acid derivatives of the formula I ##STR1## here R.sup.1 is a tetrazole [sic], nitrile [sic], a group COOH or a radical which can be hydrolyzed to COOH, and the other substituents have the meaning explained in the description.
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