Renaissance Pharma has acquired certain assets and the U.S. rights to manufacture, market and sell Denavir  (1% penciclovir cream), from Deerfield Management Co. and New American Therapeutics, a Deerfield portfolio company. Denavir is a topical antiviral for the treatment of recurrent cold sores.    With the acquisition of Denavir, Renaissance has established a new subsidiary, Prestium Pharma, focused on commercializing branded products in the U.S. John Denman will serve as general manager of Pr...