1-benzyl-4-benzyloxy-5-oxo-cyclopent-3-ene-1,3-dicarboxylic acid diethyl ester

trimethyl-(2-trimethylsilyloxycyclopenten-1-yl)oxysilane

溴化苄

monosodium mono(1,3-bis(methoxycarbonyl)-4,5-dioxocyclopentane-1,3-diide)

2-环戊烯酮