Compounds are provided having the formula (I) ##STR00001## wherein X for each occurrence is N or C-A, and R, Y, A and n are as defined herein, which compounds are dipeptidyl peptidase IV inhibitors and as such are useful in treating diabetes and micro- and macrovascular complications of diabetes, such as retinopathy, neuropathy, and nephropathy.A method for treating diabetes and related diseases employing the above compounds is also provided.

 
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> 4-((phenoxyalkyl)thio)-phenoxyacetic acids and analogs
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