The compound 5 wherein X and {HEAD ~ X1} are independently selected from {TAIL ~ the group} consisting of Cl, CF3CO2, CH3CO2, CFH2CO2, 3CO, 2CO, 2CO, PhO, MeO, EtO, tosylate, mesylate, and trifluoromethanesulfonate 
are independently selected from
The compound 5 wherein X and { HEAD ~ X1 } are independently selected from { TAIL ~ the group } consisting of Cl , CF3CO2 , CH3CO2 , CFH2CO2 , 3CO , 2CO , 2CO , PhO , MeO , EtO , tosylate , mesylate , and trifluoromethanesulfonate
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH