Drugmaker Warner-Lambert Co., struggling to fend off a $77 billion takeover bid from Pfizer Inc., sued to dismantle the companies’ marketing partnership over Warner-Lambert’s Lipitor, the top-selling U.S. anti-cholesterol drug.

In a counterclaim filed in Delaware Chancery Court Nov. 29, Warner-Lambert contends Pfizer’s unwanted bid violated a so-called “standstill agreement” included in the Lipitor marketing pact.

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