3-乙酰基-5-溴-8-羟基-3,4-二氢-2H-1-萘酮

(+/-)-6-ethynyl-6-hydroxy-5,6,7,8-tetrahydrohomophthalic anhydride

2-[1-Ethoxycarbonyl-meth-(Z)-ylidene]-4-oxo-cyclohexanecarboxylic acid ethyl ester

(+/-)-2-carboxy-5-ethynyl-5-hydroxycyclohex-1-enylacetic acid

ethyl (+/-)-2-ethoxycarbonyl-5-ethynyl-5-hydroxycyclohex-1-enylacetate