UPDATE: 5/7/14, 9:43 a.m. EDT. Allen & Overy, Jones Day and leading German firm Gleiss Lutz also had roles advising Bayer on its over-the-counter drug buy from Merck, which is being advised on European antitrust matters by Cleary Gottlieb Steen & Hamilton, according to German legal publication Juve.

In the latest large M&A deal in the pharmaceutical sector, a trio of Am Law 100 firms are advising on the $14.2 billion sale of Merck & Co.’s consumer care business to German drug giant Bayer AG.