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