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

The transaction, announced Tuesday, will make Bayer the world’s second-largest consumer health care company should the deal close as expected in the second half of this year. Bayer won an auction for the Merck’s business. The deal will make Bayer one of the top providers of over-the-counter health products and drugs.