Compounds of formula (I) ##STR00001## wherein A, B, b, W, X, Y, Z, R.sup.1, R.sup.2, and R.sup.3 have the meanings given in claim 1, pharmaceutical compositions these compounds, and methods of preventing or treating metabolic disorders and/or eating disorders, particularly obesity, bulimia, anorexia, hyperphagia, and diabetes using these compounds.