It is also preferred, in one embodiment, that {HEAD ~ the dicarboxylic acid} not possess {TAIL ~ other reactive groups} than the acid groups, at least groups that readily react with primary amine functionalities 
not possess
It is also preferred , in one embodiment , that { HEAD ~ the dicarboxylic acid } not possess { TAIL ~ other reactive groups } than the acid groups , at least groups that readily react with primary amine functionalities
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH