An initial attempt of protection by {HEAD ~ acylation} of {TAIL ~ sulfhydryl group} resulted in maintaining duration of the activity to some extent 
of
An initial attempt of protection by { HEAD ~ acylation } of { TAIL ~ sulfhydryl group } resulted in maintaining duration of the activity to some extent
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH