Representative substituted alkyl groups may be substituted one or more times with, for example, amino, thio, hydroxy, cyano , alkoxy, and {HEAD ~ halo groups} such as F, Cl, {TAIL ~ Br}, and I groups 
Representative substituted alkyl groups may be substituted one or more times with , for example , amino , thio , hydroxy , cyano , alkoxy , and { HEAD ~ halo groups } such as F , Cl , { TAIL ~ Br } , and I groups
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 HEAD REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH