. "lactacystin" . . . . . . "Lactacystin" . . . . . . . "Lactacystin" . . . . . . . . . "(2R)-2-Acetamido-3-({(2R,3S,4R)-3-hydroxy-2-[(1S)-1-hydroxy-2-methylpropyl]-4-methyl-5-oxopyrrolidine-2-carbonyl}sulfanyl)propanoic acid" . . .