The present invention is directed to compounds of Formula I:
##STR1##
and Formula II:
##STR2##
(where variables R1, R2, R3, R4,
A, B, G, J, Q, T, U, V, W, X and Y are as defined herein) useful as antagonists
of CGRP receptors and useful in the treatment or prevention of diseases in which
the CGRP is involved, such as headache, migraine and cluster headache. The invention
is also directed to pharmaceutical compositions comprising these compounds and
the use of these compounds and compositions in the prevention or treatment of such
diseases in which CGRP is involved.