Compounds of the formula: ##EQU1## wherein R and R.sup.1 represent alkyl of 1 through 4 carbon atoms, X.sup.1 and Y.sup.1 represent oxygen or sulphur, and X.sup.2 and Y.sup.2 represent oxygen or sulphur, at least one of X.sup.2 and Y.sup.2 representing sulphur, possess fungicidal and anthelmintic properties.