2-甲基乙酰乙酸乙酯

2-(dimethylamino)-5,6-dimethyl-1,3-oxazin-4-one

5,6-dimethyl-2-phenyl-1,3-oxazin-4-one

S-tert-butyl 2-methyl-3-oxobutanethioate

N-benzyl-2-methyl-3-oxobutanamide