Compounds of the formula: ##STR1## where R is hydrogen or A--(CF.sub.2).sub.m --CH.sub.2 --; A is --F or --H; n is an integer from 1 to 10, inclusive; m is an integer from 0 to 9, inclusive; p is an integer from 0 to 4, inclusive; and Y is hydrogen, halo, trifluoromethyl, alkyl of 1 to 6 carbon atoms, alkoxy of 1 to 6 carbon atoms, or hydroxy; or a pharmaceutically acceptable salt thereof. The compounds are useful as anti-hyperglycemic and anti-hyperinsulinemic agents.