Amidino-urea serotonin receptor ligands and compositions, their pharmaceutical uses, and methods for their snythesis

Novel amidino-urea 5-HT7 receptor ligands, methods of preparing such ligands, intermediate compounds useful in the preparation of the receptor ligands, pharmaceutical compositions comprising the receptor ligands, and methods of treating sleep disorders, pain, depression, and schizophrenia employing the receptor ligands are disclosed. The receptor ligands have formula (1): wherein the formula variables are as defined herein, and pharmaceutically acceptable salts, solvates, active metabolites, or prodrugs thereof.