{TAIL ~ wherein R1}, R2, R3, R4, and R5 are each selected from the group consisting of hydrogen, hydroxy, amino, alkyl, alkoxy, cycloalkyl or phenol, optionally substituted with {HEAD ~ alkyl}, alkoxy, hydroxy or halo, and only one of R1, R2, R3, R4, and R5 is amino 
{ TAIL ~ wherein R1 } , R2 , R3 , R4 , and R5 are each selected from the group consisting of hydrogen , hydroxy , amino , alkyl , alkoxy , cycloalkyl or phenol , optionally substituted with { HEAD ~ alkyl } , alkoxy , hydroxy or halo , and only one of R1 , R2 , R3 , R4 , and R5 is amino
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH