SAN DIEGO & BRANFORD, Conn.--(BUSINESS WIRE)--Ligand Pharmaceuticals Incorporated (NASDAQ:LGND) and Neurogen Corporation (NASDAQ:NRGN) announced today they have entered into a definitive merger agreement under which Ligand will acquire Neurogen. Under the transaction, Neurogen stockholders will receive an estimated $11 million in Ligand common stock and will be granted Contingent Value Rights (“CVRs”) under four CVR agreements. The CVRs would entitle Neurogen shareholders to cash payments for the sale or licensing of certain assets and the achievement of a specified clinical milestone. The Ligand and Neurogen Boards of Directors have unanimously voted in favor of this transaction.