| abstract |
The compounds of structural formulae (I) and (II) and use of the compounds and salts and hydrates thereof, as therapeutic agents, is disclosed. A compound of formula (I) or (II) is an agonist for the ν and δ opioid receptors, and antagonist for the λ opioid receptor, and has high affinity at all three receptors. A compound of formula (I) or (II) has utility in a variety of therapeutic and research areas where λ opioid receptor antagonism is beneficial, including the treatment of opiate addiction or pain, or in a method of stimulating an immune system of a human. |