In this Monday, Nov. 23, 2015, file photo, a man enters Pfizer's world headquarters, in New York. Pfizer is buying biopharmaceutical company Medivation in a deal valued at about $14 billion. Medivation Inc.’s stock soared more than 19 percent in Monday, Aug. 22, 2016 premarket trading. (AP Photo/Mark Lennihan, File)
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