Sanofi-Aventis, already challenging the legality of Apotex's generic launch of the blood-thinner Plavix, says it is suing the Novartis generics unit Sandoz over plans to sell a generic version of the anti-coagulant Lovenox. The legal action is seen as part of a battle by brand-name drugmakers to hold off generic versions of their drugs in the important U.S. market.

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