In one aspect, the invention provides {HEAD ~ a copolyesteramide} of {TAIL ~ formula} : 
of
In one aspect , the invention provides { HEAD ~ a copolyesteramide } of { TAIL ~ formula } :
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH