The covalently cross linked {TAIL ~ amine homopolymer} 1, having {HEAD ~ the chemical formula} 
The covalently cross linked { TAIL ~ amine homopolymer } 1 , having { HEAD ~ the chemical formula }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD