Compounds of formula I ##STR1## wherein R.sub.1 -R.sub.5, X, Ar and Y are as defined in the description, have valuable pharmaceutical properties and are especially effective as leukotriene antagonists. They are prepared in a manner known per se.
式I的化合物##STR1##其中R.sub.1-R.sub.5,X,Ar和Y如描述中所定义,具有有价值的药物特性,并且在作为
白三烯拮抗剂方面特别有效。它们的制备方法是已知的。