Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A new synthesis of 4,5-methano-L-prolines and the enzymatic activity of the corresponding N-(3-mercapto-2-R-methyl-propionyl) analogs as inhibitors of angiotensin converting enzyme are described. ... For excellent summaries, see Burger's Medicinal Chemistry and Drug ...