The invention relates to biphenylcarboxamides of the formula (I) ##STR00001## in which A, R, Z, X, Y, m and n are each as defined in the disclosure, to a plurality of processes for preparing these substances, to their use for controlling undesirable microorganisms, and to novel intermediates and their preparation.

 
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> N,N'-substituted-1,3-diamino-2-hydroxypropane derivatives

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