2-甲基-6-氧代-1-2,6-二氢-3-羧酸乙酯

ethyl 6-amino-2-methylpyridine-3-carboxylate

2-氨基-5-溴-6-甲基吡啶

(2E,4Z)-5-ethyl 1-methyl 4-(1-aminoethylidene)pent-2-enedioate

乙酰乙酸乙酯