Compounds of general formula (I), in which Het represents a five or six membered saturated, partially unsaturated or aromatic ring containing between one and six heteroatoms of the group N, O, S, in which the heterocycle is substituted in an adjacent manner with --P-Q.sup.1-T-Q.sup.2, -GZ and Y, such that the substituant -GZ is adjacent to both, the other substituants being as defined in the description, process for preparing this compound, fungicidal composition comprising this compound, method for treating plants by applying this compound or composition. ##STR00001##