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(S)-N-Boc-(4-Pyridyl)alanine BOC-L-4-Fluorophe Boc-3-(2-pyridyl)-L-alanine Boc-3-(3-pyridyl)-L-alanine BOC-D-3,5-DIFLUOROPHE DL-3,5-DIFLUOROPHENYLALANINE ERYTHRO-N-BOC-L-3,5-DIFLUOROPHENYLALANINE EPOXIDE