4-(2-tert-Butoxycarbonylamino-3-phenyl-propionylamino)-butyric acid;4-{[N-(tert-butoxycarbonyl)phenylalanyl]amino}butanoic acid;4-{[N-(tert-butoxycarbonyl)-L-phenylalanyl]amino}butanoate;4-{[N-(tert-butoxycarbonyl)-D-phenylalanyl]amino}butanoate
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