Compounds of Formula (I) that act as antagonists at the mu, kappa and/or
delta opioid receptors and therefore useful in the treatment of diseases,
conditions and/or disorders that benefit from such antagonism in animals
are described herein. ##STR00001## where R.sup.1, R.sup.2, R.sup.3,
R.sup.4, R.sup.5, and R.sup.6 are described herein.