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(2011/04/26)N-butyryl-N'-[3-(2-oxopyrrolidin-1-yl)propyl]-O-phosphono-L-tyrosinamide
N-butyryl-N'-[2-(2-oxoimidazolidin-1-yl)ethyl]-O-phosphono-L-tyrosinamide
N-butyryl-N'-[3-(2-oxotetrahydropyrimidin-1(2H)-yl)propyl]-O-phosphono-L-tyrosinamide
O-[bis(benzyloxy)phosphoryl]-N-butyryl-N'-[3-(2-oxotetrahydropyrimidin-1(2H)-yl)propyl]-L-tyrosinamide
O-[bis(benzyloxy)phosphoryl]-N-butyryl-N'-[2-(2-oxoimidazolidin-1-yl)ethyl]-L-tyrosinamide