trans-4-ethyltetrahydro-5-oxo-3-furoic acid;(3R,4R)-4-ethyl-5-keto-tetrahydrofuran-3-carboxylic acid;(3R,4R)-4-ethyl-5-oxo-oxolane-3-carboxylic acid;(3R,4R)-4-ethyl-5-oxooxolane-3-carboxylic acid
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