N-苄氧羰基-L-亮氨酰-L-亮氨酸

1-(4-isobutyl-5-oxo-4,5-dihydro-oxazol-2-yl)-3-methyl-butyl-carbamic acid benzyl ester

diethyl 2-acetamido-2-(2-methylprop-2-enyl)propanedioate

亮氨酸脑啡肽

acetyl leucine enkephalin