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D-ALPHA-METHYLTRYPTOPHANE (S)-(+)-2-AMINO-2-METHYLBUTANEDIOIC ACID Clasto-Lactacystin ?-lactone (1R,3R)-1-AMINOCYCLOPENTANE-1,3-DICARBOXYLIC ACID ACPT-I (3R,4S,5S,6S)-1-AZA-5-CARBOXYL-4-HYDROXY-6-ISOPROPYL-3-METHYL-7-OXABICYCLO[3.3.0]OCTAN-2-ONE 2,2,6,6-TETRAMETHYLPIPERIDINE-1-OXYL-4-AMINO-4-CARBOXYLIC ACID