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(S)-1-benzyl 4-methyl 2-aminosuccinate
(S)-3-amino-4-(benzyloxy)-4-oxobutanoic acid
(S)-1-benzyl 4-methyl 2-(9-phenyl-9H-fluoren-9-ylamino)succinate
methyl iodide
(2S,3R)-benzyl 4-(tert-butyldimethylsilyloxy)-3-methyl-2-(9-phenyl-9H-fluoren-9-ylamino)butanoate
(3S,4R)-4-methyl-3-(9-phenyl-9H-fluoren-9-ylamino)dihydrofuran-2(3H)-one
(2S,3S)-benzyl 4-hydroxy-3-methyl-2-(9-phenyl-9H-fluoren-9-ylamino)butanoate
(2S,3R)-2-Methyl-3-(9-phenyl-9H-fluoren-9-ylamino)-succinic acid 4-benzyl ester
(2S,3S)-2-Methyl-3-(9-phenyl-9H-fluoren-9-ylamino)-succinic acid 4-benzyl ester