1. Process Research and Development, Merck & Co. Inc., 770 Sumneytown Pike, West Point, Pennsylvania 19486, United States
2. Process Research and Development, Merck & Co. Inc., 2000 Galloping Hill Road, Kenilworth, New Jersey 07033, United States
3. Process Research and Development, Merck & Co. Inc., 126 E. Lincoln Ave, Rahway, New Jersey 07065, United States