ethyl (2R)-2-acetyl-2-methyl-5-oxohexanoate

ethyl (2S)-2-acetyl-2-methyl-5-oxohexanoate

3-phenyl-2H,6H-[1,3,4]thiadiazino[2,3-b]quinazolin-6-one

ethyl (S)-2-acetyl-5-chloro-2-methyl-4-hexenoate

2-甲基乙酰乙酸乙酯