Process for producing {HEAD ~ a polyamide} based on a dicarboxylic acid and {TAIL ~ a diamine} 
based on
Process for producing { HEAD ~ a polyamide } based on a dicarboxylic acid and { TAIL ~ a diamine }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL