Refer to the input text as context and select the correct relationship between 'Sanofi' and 'Regeneron Pharmaceuticals' from the available options.
Options: legal form, owner of, director/manager, founded by

In a separate report earlier this week, ICER said its analyses found that two new cholesterol drugs, Repatha from Amgen Inc and Praluent from partners Sanofi SA and Regeneron Pharmaceuticals Inc, should be sold at a 67 percent discount from list prices.
owner of