1-(3-甲基-4,5-二氢-1,2-恶唑-5-基)乙酮

4-hydroxy-4-(5-methyl-3-phenyl-1,4,2-dioxazol-5-yl)butan-2-one

4c-(5-methyl-3-phenyl-[1,4,2]dioxazol-5-yl)-but-3-en-2-one

3-氧丁酸

丙酮醛