3,5-二羟基甲苯

2-hydroxy-6-methyl-4-oxo-cyclohex-1-enecarboxylic acid methyl ester

1,5-dimethoxy-3-methylcyclohexa-1,4-diene

1-ethoxy-hex-4-en-1-yn-3-one

1-ethoxy-hex-4-en-1-yn-3-ol