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