{TAIL ~ Aryl groups} can be substituted with {HEAD ~ up to four independently selected R12 groups}, as described herein 
{ TAIL ~ Aryl groups } can be substituted with { HEAD ~ up to four independently selected R12 groups } , as described herein
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH