1. Department of Process and Analytical Chemistry, Merck Research Laboratories, Merck and Co. Inc., Rahway, NJ 07065, USA.
2. Department of Pharmacokinetics, Pharmacodynamics and Drug Metabolism, Merck Research Laboratories, Merck and Co. Inc., West Point, PA 19486, USA.
3. Department of Pharmacology, Merck Research Laboratories, Merck and Co. Inc., Kenilworth, NJ 07033, USA.
4. Department of Discovery Chemistry, Merck Research Laboratories, Merck and Co. Inc., Kenilworth, NJ 07033, USA.
5. Department of Discovery Chemistry, Merck Research Laboratories, Merck and Co. Inc., West Point, PA 19486, USA.
6. Department of Discovery Chemistry, Merck Research Laboratories, Merck and Co. Inc., Rahway, NJ 07065, USA.
7. Department of Discovery Chemistry, Merck Research Laboratories, Merck and Co. Inc., Boston, MA 02115, USA.