Samsung Biologics Co. Ltd. has agreed to buy out Biogen Inc.’s stake in the joint venture Samsung Bioepis Co. Ltd. for $2.3 billion. Biogen will receive $1 billion in cash at closing and $1.25 billion in deferred payments of $812.5 million due at the first anniversary and $437.5 million due at the second anniversary of the closing of the transaction. Biogen is also expected to receive up to $50 million upon achievement of certain commercial milestones.