Compounds represented by the formula ##STR1## wherein R is ##STR2## R.sup.1 is 2-pyridyl, 3-pyridyl, 4-pyridyl or 2-thiazyl, R.sup.2 is lower alkyl and n is 1 or 2,And acid addition salts of the compounds wherein R.sup.1 is 2-pyridyl, 3-pyridyl or 4-pyridyl are disclosed as useful as anthelmintics against a broad spectrum of helminths. Processes for making the active compounds and novel intermediates useful therein are also disclosed.