Bombesin receptor antagonists

Bombesin receptor antagonists are provided which are useful for the diagnosis, prevention, or treatment of male sexual dysfunction in humans and animals, female sexual dysfunction in humans and animals, anxiety and panic disorders, social phobia, depression, psychoses, sleeping disorders, memory impairment, pulmonary hypertension, lung repair and lung development disorders, cancer including prostate cancer and pancreatic cancer, hepatic porphyria, gastrointestinal secretory disturbances, gastrointestinal disorders including colitis, Crohn's disease and inflammatory bowel disease, emesis, anorexia, pain, seasonal affective disorders, feeding disorders, or pruritus. The compounds of formula (I) or pharmaceutically acceptable salts thereof: wherein k, l, m, n, X, Ar, Ar , R , R , R , R , R and R are as defined in the description.