As shown in FIG 2, {HEAD ~ the carboxylic acid group} of TTNPB is covalently linked to {TAIL ~ a para hydroxyphenyl amine} thus yielding the 4 HPTTNPB 
As shown in FIG 2 , { HEAD ~ the carboxylic acid group } of TTNPB is covalently linked to { TAIL ~ a para hydroxyphenyl amine } thus yielding the 4 HPTTNPB
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH