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