The racemic title compound, C(12)H(16)O(6)S, possesses a five-membered ring that adopts an envelope-shaped conformation; the two hy-droxy groups occupy quasi-axial positions. Adjacent mol-ecules are linked by O-H⋯O hydrogen bonds to generate a ribbon that runs along the a axis of the ortho-rhom-bic unit cell. The crystal studied was an inversion twin.
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