Compounds of formula I ##STR00001## wherein the groups and residues A, B, b, X, Y, Z, R.sup.1, R.sup.2, R.sup.3, R.sup.5a and R.sup.5b have the meanings given in claim 1. The invention further relates to pharmaceutical compositions containing at least one amide according to the invention. As a result of their MCH-receptor antagonistic activity the pharmaceutical compositions according to the invention are suitable for the treatment of metabolic disorders and/or eating disorders, particularly obesity, bulimia, anorexia, hyperphagia, and diabetes.