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The third time’s the charm for the antibiotic developer Tetraphase Pharmaceuticals. It has agreed to be purchased by Melinta Therapeutics for $39 million and up to $16 million more.Tetraphase struck a $14 million deal in March to be bought by AcelRx. Then in May, the firm said it was considering a $22 million offer from La Jolla Pharmaceutical. Tetraphase has amassed more than $600 million in losses over the years as it developed its tetracycline Xervara.
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