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