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The title compound, C 10 H 14 O 5 , is an inter­mediate in our study of the asymmetric synthesis of α-hydroxy­alkanoic acids. The structure consists of 1,4-dioxaspiro[4,5]decane skeleton formed when the cyclohexylidene group binds to both of the hydroxyl groups of carboxylic groups of the starting malic acid. The six-membered ring adopts a chair conformation.

(2S)-2-(3-Oxo-1,4-dioxaspiro[4.5]decan-2-yl)ethanoic acid