As a continuation of work on K-acylcysteines,'v2 a number of cysteine and cystine derivatives, including several K-acylcysteine salts, were synthesized. The mucolytic effects of representative compounds have been reported. 3a The biological activities of many of these derivatives as amino acid antagonists in bacteria are presented else~ here.~~ The selective?;-acylation method, Iv2 involving the reaction of a mercaptoaniino acid with an ...
