3-butyl-2-methyl-4-oxo-cyclohex-2-enecarboxylic acid ethyl ester

2-methyl-2-non-4-ynyl-[1,3]dioxolane

undec-6-yn-2-one

2-甲基-4-羰基-2-环己烯-1-羧酸乙酯

6-butyl-1-methoxy-5-methylcyclohexa-1,4-diene