Affiliation: | a Department of Medicinal Chemistry, Merck Research Laboratories, RY 121-240, PO Box 2000, Rahway, NJ 07065, USA b Department of Immunology Research, Merck Research Laboratories, PO Box 2000, Rahway, NJ 07065, USA c Department of Antiviral Research, Merck Research Laboratories, West Point, PA 19486, USA |