Download 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. ... N-Protected dipeptidoylbenzotriazoles react with aqueous ammonia to give dipeptide primary amides (77–98%) and with N-unprotected α-amino amides to afford tripeptide primary amides (82–86%). ... Chemical structures of the aspartyl protease inhibitors l-682,679 and ...