Compounds of the formula ##STR1## where R.sup.2 is a 5-membered or 6-membered heterocyclic structure possessing one or two hetero atoms or is phenyl which is unsubstituted or substituted by R.sub.n, R is hydrogen, alkyl, alkoxy, alkylthio, alkylsulfonyl, halogen, haloalkyl, nitro, cyano, unsubstituted or substituted phenyl, unsubstituted or substituted phenoxy or unsubstituted or substituted amino, R.sup.1 is alkyl, cycloalkyl, cycloalkylalkyl, unsubstituted or substituted aryl, unsubstituted or substituted aralkyl, unsubstituted or substituted aryloxyalkyl, unsubstituted or substituted benzyloxyalkyl, unsubstituted or substituted alkenyl, unsubstituted or substituted alkynyl or (CH.sub.2 --CH.sub.2 O).sub.m --R.sup.4, where R.sup.4 is C.sub.1 -C.sub.4 -alkyl, unsubstituted or substituted aryl or unsubstituted or substituted benzyl and m is 1, 2, 3 or 4, Het is 1,2,4-triazol-1-yl, imidazol-1-yl or pyrid-3-yl, n is 1, 2, 3, 4 or 5, Z is CH.sub.2, oxygen, SO.sub.t or (R.sup.3 N), where t is 0, 1 or 2 and R.sup.3 has the same meanings as R.sup.1 and is identical to or different from R.sup.1 or together with R.sup.1 forms a diradical of the formula --(CH.sub.2).sub.k -- X--(CH.sub.2).sub.1 --, where k and 1 independently of one another are each 1, 2, 3, 4 or 5, and X is O, S or NH, or Z--R.sup.1 is unsubstituted or substituted phenyl, and their plant-tolerated acid addition salts, and fungicides containing them.