4-甲氧基-2-氧代-1,2-二氢-3-氰基吡啶

甲基碘

2,4-dimethoxypyridine-3-carbonitrile

1,2-dihydro-4-methoxy-1-methyl-2-oxopyridine-3-carboxylic acid

硫酸二甲酯