Compounds of formula (I)wherein the other substituents MBG, HetAr, R1, R2, R3 and R4are as defined in claim 1, and their use in compositions and methods for the control and/or prevention of microbial infection, particularly fungal infection, in plants and to processes for the preparation of these compounds.具有式(I)之化合物其中其他取代基MBG、HetAr、R1、R2、R3和R4係如在申請專利範圍第1項中所定義;以及它們在用於控制和/或防止植物中的微生物侵染(特別是真菌侵染)之組合物及方法中之用途;並且涉及用於製備該等化合物之方法。