... Sci. 1987, 8, 44. 0 1990 American Chemical Society Page 2. ... 88,89694 Page 3. Benzimidazolone Derivatives as 5-HT8 Antagonists Journal of Medicinal Chemistry, 1990, Vol. 33, No. 8 2103 Table I. Physical Data for 2,3-Dihydro-2-oxo-lH-benzimidazole-l-carboxylic ...