The mixture is then treated with {HEAD ~ an anhydrous tertiary amine base}, such as for example, pyridine, followed by {TAIL ~ benzoyl chloride} to acylate the resulting alcohol 
followed by
The mixture is then treated with { HEAD ~ an anhydrous tertiary amine base } , such as for example , pyridine , followed by { TAIL ~ benzoyl chloride } to acylate the resulting alcohol
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH