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