3-(dimethylaminomethylidene)-6-methylpyran-2,4-dione

2,4-二氯-6-甲基吡啶-3-甲酸乙酯

4-羟基-6-甲基-2-吡啶酮-3-羧酸乙酯

ethyl 2-chloro-4-methoxy-6-methylpyridine-3-carboxylate

2-氯-4-乙氧基-6-甲基-烟酸乙酯