(Bloomberg) - A unit of German drugmaker Bayer AG (BAYN) sued India’s Lupin Ltd. in federal court alleging infringement of a U.S. patent for the birth-control pill Natazia.

Bayer Pharma AG, based in Berlin, contends Mumbai-based Lupin is planning to offer a generic copy of Natazia in the U.S. before the patent expires in 2026, according to a complaint filed yesterday in Wilmington, Del.

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