4,6-二甲基-2-吡喃酮

2,4-二甲基-6-氧代-吡喃-3-羧酸丙基酯

1-(carbamoylamino)-2,4-dimethyl-6-oxopyridine-3-carboxylic acid

3-甲基戊烯二酸二乙酯

isodehydroacetic acid chloride