A series of mercaptoacylamino acids containing tyrosine, dopa and α-methyldopa moieties is reported, and the structure-activity relationships are discussed. These compounds were tested for antihypertensive activity, and some of the compounds exhibited inhibitory activity against angiotensin I-converting enzyme. N-(2-Mercaptopropanoyl)-L-tyrosine-b (6b) was found to be 5 times more potent than N-(2-mercaptopropanoyl)-L-phenylalanine-a (Ia).
