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N-Acetyl-L-aspartic acid Fmoc-Asp(OtBu)-OH N-Carbobenzyloxy-L-aspartic acid Boc-Asp-OtBu (R)-(-)-2-AMINO-2-METHYLBUTANEDIOIC ACID N-Methyl-D-aspartic acid (R)-(-)-2-Amino-2-methylbutanedioic Acid Hydrochloride Salt (S)-(+)-2-Amino-2-methylbutanedioic Acid Hydrochloride Salt H-ALA-ASP-OH (S)-(+)-2-AMINO-2-METHYLBUTANEDIOIC ACID