R6, R8, R12, and {HEAD ~ R13} are independently selected from {TAIL ~ the group} consisting of hydrogen, alkyl, alkoxyalkyl, polyfluoroalkyl, hydroxyalkyl, polyhydroxyalkyl, aralkyl, R9, —R15 and —R9 
independently selected from
R6 , R8 , R12 , and { HEAD ~ R13 } are independently selected from { TAIL ~ the group } consisting of hydrogen , alkyl , alkoxyalkyl , polyfluoroalkyl , hydroxyalkyl , polyhydroxyalkyl , aralkyl , R9 , — R15 and — R9
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH