{TAIL ~ Any aniline derivative} having {HEAD ~ an unsubstituted NH2 group} or akylamine having an unsubstituted NH2 group is then added to the mixture 
{ TAIL ~ Any aniline derivative } having { HEAD ~ an unsubstituted NH2 group } or akylamine having an unsubstituted NH2 group is then added to the mixture
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH