. . . . . . . . . . . . . . . . "Z-Leu-Leu-Leu-al" . "MG132" . . "N-Benzyloxycarbonyl-(L)-leucyl-(L)-leucyl-(L)-leucinal" . . . "MG132" . "Benzyl[(2S)-4-methyl-1-{[(2S)-4-methyl-1-{[(2S)-4-methyl-1-oxopentan-2-yl]amino}-1-oxopentan-2-yl]amino}-1-oxopentan-2-yl]carbamate" . .