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In the title compound C11H17NO4S, an intra­molecular O—H...O hydrogen bond forms an S(8) ring and determines the conformation of the bis­(2-hy­droxy­eth­yl) segment of the mol­ecule, holding the two CH2CH2OH groups close to coplanar (r.m.s. deviation = 0.185 Å). In the crystal, O—H...O hydrogen bonds link the mol­ecules into zigzag chains along the b axis. Weaker additional C—H...O and C—H...π contacts generate a three dimensional network, with mol­ecules stacked along the b-axis direction.
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