Compounds of the formula ##STR1## wherein n is a integer of 0 to 2; R.sub.1 ' and R.sub.2 ' are, independently, hydrogen, halogen, trifluoromethyl, lower alkoxy or lower alkyl; and X is pyrimidinyl, thiazolyl or ##STR2## wherein R is hydrogen, lower alkyl, aryl or ar-lower alkyl; provided that at least one or R.sub.1 ' and R.sub.2 ' is other than hydrogen,and their pharmaceutically acceptable acid addition salts, and an anti-inflammatory method utilizing a compound of the formula ##STR3## wherein n is an integer of 0 to 2; R.sub.1 and R.sub.2 are, independently, hydrogen, halogen, trifluoromethyl, nitro, amino, lower alkylamino, di-lower-alkylamino, lower alkoxy or lower alkyl; and X is pyrimidinyl, thiazolyl or ##STR4## wherein R is hydrogen, lower alkyl, aryl or ar-lower alkyl; and their pharmaceutically acceptable acid addition salts, are described.