4-(4-氧代丁基)苯甲酸甲酯

2-(cyclohexylamino)acetonitrile

3-iminobutanenitrile

3-Methoxalyl-4-oxo-4H-chinolizin-1,2-dicarbonsaeure-dimethylester

tetramethyl 9aH-quinolizine-1,2,3,4-tetracarboxylate