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