Isopentyl carboxymethyl anilides for controlling undesirable microorganisms

[Chemical 1] The present invention relates to novel isopentylcarboxyanilides of the formula (I) in which L, R 1 , R 3 and A have the meanings mentioned in the description, several methods for the production of these substances and undesirable microorganisms It relates to its use for the control of as well as intermediate products and their production.