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N-Methyl-L-aspartic acid L-Aspartic acid N-Boc-L-Homoserine Mono-tert-butyl succinate (S)-(-)-2-(Boc-Amino)-1,4-butanediol H-ASP-OTBU BOC-ASP(OTBU)-OSU L-Aspartic acid 4-tert-butyl ester H-GLY-OTBU ACOH DL-Homoserine