1. Department of Process Research and Development, Merck & Co., Inc., 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
2. Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
3. Department of Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
4. Department of Discovery Chemistry, Merck & Co., Inc., Boston, Massachusetts 02115, United States