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The title compound, C10H9NO3, was synthesized by the condensation reaction of isatin (systematic name 1H-indole-2,3-dione) with glycol in presence of p-toluene­sulfonic acid. The indol-2-one ring system is essentially planar [N—C—C—C torsion angle = 3.1 (2)°], and the 1,3-dioxolane ring is slightly distorted. The crystal structure exhibits inter­molecular N—H...O hydrogen bonds.
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