5-氰基-2-甲基-6-氧代-1,6-二氢-3-吡啶羧酸

反式-4-甲氧基-3-丁烯-2-酮

3-oxo-butyraldehyde, sodium (Z)-1-enolate

2-氨基-6-甲基-4-氧代-4H-吡喃-3-甲腈

4-hydroxy-6-methyl-2-oxo-1,2-dihydro-3-pyridinecarbonitrile