Described are compounds of the formula (I) in which Y is oxygen or an NR6 group; Z and Z are hydrogen, halogen, alkyl, alkenyl, alkinyl, alkoxy, alkenyloxy, haloalkyl, haloalkoxy, haloalkenyloxy, cyano or nitro; R is hydrogen, alkyl, haloalkyl or aryl; R is hydrogen, alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkenyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, arylalkenyl, heteroarylalkenyl, aryloxyalkyl, heteroarylalkyl, arylalkenyl, heteroarylalkenyl, aryloxyalkyl, heteroaryloxyalkyl, acyl, arylcarbonyl, heteroarylcarbonyl or alkoxycarbonyl and R , R , R and R are hydrogen or alkyl, whereby R and R can together form a ring. Also described are fungicides containing these compounds.