52555-26-7 N-(1-Cyclohexyl-2,5-dihydro-4-nitro-2-oxo-1H-pyrrol-3-yl)-L-phenylalanine N-(4-Nitro-1-cyclohexyl-2-oxo-3-pyrrolin-3-yl)-L-phenylalanine N-(4-Nitro-1-cyclohexyl-2-oxo-3-pyrrolin-3-yl)phenylalanine Nopy-L-phenylalanine