compounds of the formula ## str1 ## or a pharmaceutically or agriculturally acceptable acid addition salt thereof , wherein r is 5 - chloro - 2 - pyridyl , or phenyl optionally substituted by one to three substituents , each independently selected from f , cl , br , i , cf 3 , c 1 - c 4 alkyl and c 1 - c 4 alkoxy ; r 1 is cn , csnh 2 or conr 2 r 3 where either r 2 is h or certain alkyl groups and r 3 is h or certain alkyl , substituted alkyl , aralkyl , phenyl or cycloalkyl groups , or r 2 and r 3 taken together with the nitrogen atom to which they are attached form a nitrogen heterocyclic group , optionally containing an oxygen atom or nr 4 group , as a ring member and r 4 is h , c 1 - c 4 alkyl ; c 2 - c 4 alkanoyl or carbonyl ; r 5 and r 6 are each h or ch 3 ; methods for their use in combatting fungal infections in plants , seeds and animals , including humans , pharmaceutical and agricultural compositions containing them and intermediates therefor .