Sanofi-Synthélabo was a Paris-based pharmaceutical company formed in 1999, when Sanofi merged with Synthélabo. Sanofi-Aventis
Sanofi S.A. is a multinational pharmaceutical company headquartered in Paris, France, the world's fourth-largest by prescription sales. Sanofi engages in the research and development, manufacturing and marketing of pharmaceutical products for sale principally in the prescription market, but the...

 was formed in 2004 when Sanofi-Synthélabo merged with Aventis
Aventis was a pharmaceutical and lab assay testing company. It was formed in 1999 when Rhône-Poulenc S.A. merged with Hoechst AG. The merged company was based in Strasbourg, France. With its headquarters in Strasbourg, Aventis was the product of the first transnational merger to combine large...


Sanofi was created in 1973.

Synthélabo was created in 1970. It was purchased in 1973 by L'Oréal
The L'Oréal Group is the world's largest cosmetics and beauty company. With its registered office in Paris and head office in the Paris suburb of Clichy, Hauts-de-Seine, France, it has developed activities in the field of cosmetics...

, the world's cosmetic leader.
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