Shin Nippon Biomedical Laboratories Ltd. (SNBL) agreed to acquire Satsuma Pharmaceuticals Inc.as part of a deal worth as much as $220 million that includes rights to the STS-101 migraine drug. Shin Nippon will pay 91 cents in cash per share, as well as a non-tradeable contingent value right worth up to $5.77 per share based on the potential sale, license, or other grant of rights of Satsuma’s migraine drug STS-101.