Chemical Research Laboratories, Sankyo Co., Ltd., Hiromachi, Shinagawa, Tokyo 140, Japan. Received August 11, 1987 a-[(3S)-3-[[(S)-1-(Ethoxycarbonyl)-3-phenylpropyl] amino]- 2-oxo-6 or 7-phenylperhydroazepin-l-yl] acetic acids (monoester monoacids) and their dicarboxylic acids were synthesized, and their angiotensin-converting enzyme (ACE) inhibitory activities were evaluated. The dicarboxylic acids having phenyl substituents at ...