ethyl ((S)-4-methyl-2-nitropent-4-enoyl)-L-prolinate

2-benzoyl-3-isobutylidene-hexahydro-pyrrolo[1,2-a]pyrazine-1,4-dione

Z-L-Leu-L-Pro-OMe

脯氨酰-亮氨酸

prolinyl-L-leucine ethyl ester