Analyze the relationship between 'Sanofi' and 'Regeneron Pharmaceuticals' within the context of the input sentence.
Options: owner of, stock exchange, chief executive officer, chairperson

LONDON, July 24 (Reuters) - A new type of cholesterol drug from Sanofi and Regeneron Pharmaceuticals won a green light from European regulators on Friday, two months behind a rival product from Amgen.
owner of