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2. .beta.-Adrenergic blocking agents. 3-(3-Substituted-amino-2-hydroxypropoxy)-4-substituted-1,2,5-thiadiazoles
3. J. A. Ryan, Department of Pharmaceutical Research and Development, Merck Sharp and Dohme Research Laboratories, West Point, PA, U.S.A., personal communication.
4. S. M. Pitzenberger and J. S. Murphy, Department of Medicinal Chemistry, Merck Sharp and Dohme Research Laboratories, West Point, PA, U.S.A., personal communication.