Compounds of formula B1 with amide group X are {HEAD ~ diamides} obtained from {TAIL ~ macromolecular diamines} by well known acylation reactions using e.g., the acid chlorides or anhydrides mentioned above 
obtained from
Compounds of formula B1 with amide group X are { HEAD ~ diamides } obtained from { TAIL ~ macromolecular diamines } by well known acylation reactions using e.g. , the acid chlorides or anhydrides mentioned above
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH