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