This product is reacted with 2 2 phenyl acetonitrile to form {HEAD ~ a corresponding tert butoxycarbonyl compound}, which is then reduced with palladium/carbon and debenzylated to form {TAIL ~ 3 ethylpyrrolidine} 
debenzylated to form
This product is reacted with 2 2 phenyl acetonitrile to form { HEAD ~ a corresponding tert butoxycarbonyl compound } , which is then reduced with palladium / carbon and debenzylated to form { TAIL ~ 3 ethylpyrrolidine }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL