{HEAD ~ The base} can be, for example, pyridine, dimethylaminopyridine, {TAIL ~ quinoline}, trialkylamines, and mixtures thereof 
be
{ HEAD ~ The base } can be , for example , pyridine , dimethylaminopyridine , { TAIL ~ quinoline } , trialkylamines , and mixtures thereof
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH