4,6-二甲基-2-羟基吡啶

甲基碘

3-acetyl-1,4,6-trimethyl-2-(1H)pyridone

1,2,5-trimethyl-3-oxo-2-azabicyclo[2.2.0]hex-5-ene

5-acetyl-1,2,4-trimethyl-6-oxo-1,6-dihydro-pyridine-3-carboxylic acid