Sanofi-Aventis and Chattem, Inc. have entered into a definitive agreement under which Sanofi-Aventis is to acquire 100% of the outstanding shares of the 130-year-old marketer of brands such as Gold Bond, ACT and Selsun Blue in a cash tender offer for approximately $1.9 billion. According to the company, the transaction will create the world’s fifth-largest consumer healthcare company measured by product revenues by combining Chattem’s position as a leading U.S. consumer healthcar...