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2,3-Dichloro-4-iodopyridine
4-Methoxy-DL-tryptophan
4-Methoxy-L-tryptophan
4-(Trifluoromethoxy)-DL- phenylalanine
4-(Trifluoromethoxy)-L- phenylalanine
4-Bromopyridine 1-oxide
4-Methyl-L-tryptophan
(R)-4-Cyanothiazolidine hydrochloride
4-Carboxy-L-phenylalanine
(S)-4-Cyanothiazolidine hydrochloride