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Acta Cryst. (2002). E58, o1275-o1276 [ doi:10.1107/S1600536802019086 ]
Abstract: Both carboxyl groups in the title molecule, C9H12O4, have gauche orientations [relative to the (HOOC-)C-C(-COOH) bond] and participate in hydrogen bonds, linking the molecules into an infinite chain.
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