The present invention is directed to compounds of formula (I) or a pharmaceutically acceptable salt thereof; wherein A is (xx); X is selected from CH, CF and N, R5 is selected from H, C.sub.1-C.sub.6 alkyl, C.sub.1-C.sub.6 fluoroalkyl, and --OR12, R9 is selected from H and --C(O)NR1OR11, R12 is selected from H, C.sub.1-C.sub.6 alkyl and C.sub.3-C.sub.6 cycloalkyl for use as inhibitors of the DPP-IV enzyme in the treatment or prevention of conditions including Type II diabetes.

 
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