Heterosubstituted hydrocarbyl groups have {HEAD ~ one or more hydrogen atoms} substituted by a heteroatom, even including {TAIL ~ one carbon species} such as cyano and carboxy 
Heterosubstituted hydrocarbyl groups have { HEAD ~ one or more hydrogen atoms } substituted by a heteroatom , even including { TAIL ~ one carbon species } such as cyano and carboxy
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH