Denmark’s Union Therapeutics A/S has begun a strategic collaboration with Innovent Biologics Inc. over orismilast, a next-generation oral PDE4 inhibitor for inflammatory dermatology conditions that could compete directly with Amgen Inc.’s psoriasis blockbuster, Otezla (apremilast). At the same time, the company is looking for partners in the medium term to develop the drug in the rest of the world as it bids to take on Amgen and other dermatology players such as Bristol-Myers Squibb Co.