UCB SA has unveiled plans to acquire Zogenix Inc. in a deal worth up to $1.9 billion (€1.7 billion), adding to its portfolio an approved drug aimed at rare forms of epilepsy. Brussels-based UCB will pay $26 per share in cash for the Emeryville, Calif.-based biotech, plus a contingent value right of $2 per share, which would pay out upon approval of the oral drug Fintepla (fenfluramine) for Lennox-Gastaut syndrome.