French drugmaker Sanofi-Aventis (SASY.PA) has agreed to buy Genzyme Corp (GENZ.O) for $20.1 billion in cash, plus payments tied to the success of the company's drugs, the companies said on Wednesday.[ID:nLDE71F046] Below are some key facts about Sanofi, currently the world's fourth-largest drugmaker by sales according to IMS Health, and Genzyme, a pioneering biotechnology company which specializes in drugs for rare diseases: SANOFI HISTORY
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