Compounds are provided which have the structure
##STR1##
wherein Q is C or N, A is O or S, Z is O or a bond, X is CH or N and R1,
R2, R2a, R2b, R2c, R3, Y,
x, m, and n are as defined herein, which compounds are useful as antidiabetic,
hypolipidemic, and antiobesity agents.