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ethyl 2-oxo-2-(4,5,6,7-tetrahydro-1-benzothiophen-2-yl)acetate 2-keto-2-(4,5,6,7-tetrahydrobenzothiophen-2-yl)acetic acid ethyl ester 2-oxo-2-(4,5,6,7-tetrahydro-benzo[b]thiophen-2-yl)-acetic acid ethyl ester ethyl 2-oxo-2-(4,5,6,7-tetrahydro-1-benzothiophen-2-yl)acetat éthyle2-oxo-2-(4,5,6,7-tetrahydro-1-benzothiophén-2-yl)acetate エチル=2-オキソ-2-(4,5,6,7-テトラヒドロ-1-ベンゾチオフェン-2-イル)
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