Medicinal Chemistry Research Laboratories, New Lead Research Laboratories, and Biological Research Laboratories, Sankyo Co., Ltd., Hiromachi, Shinagawa-ku Tokyo 140, Japan. Received May 16, 1988 l-Imidazolylalkyl-substituted di-or tetrahydrobenzo [b] thiophenecarboxylic acid derivatives and related compounds were synthesized from tetrahydrobenzo [b] thiophene derivatives (1 or 4) in order to study the structure-activity ...