Y is P2 or CHCNR4 R5, wherein {HEAD ~ R3} is alkyl, {TAIL ~ arylalkyl}, or haloalkyl; and R4 and R5 are independently chosen from the group consisting of H, alkyl, n cycloalkyl, n NHC alkyl, arylalkyl, ##STR3## CCH2 OR10, CC, alkyl NHSO2 R11, CCNHR10, and CCNHCCNHR10, wherein n=1 3 
is
Y is P2 or CHCNR4 R5 , wherein { HEAD ~ R3 } is alkyl , { TAIL ~ arylalkyl } , or haloalkyl ; and R4 and R5 are independently chosen from the group consisting of H , alkyl , n cycloalkyl , n NHC alkyl , arylalkyl , # # STR3 # # CCH2 OR10 , CC , alkyl NHSO2 R11 , CCNHR10 , and CCNHCCNHR10 , wherein n=1 3
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH