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The title compound, C15H17NO4, containing two mol-ecules in the asymmetric unit is a polymorph of the crystal structure published by Martínez et al. [(2011). Eur. J. Org. Chem. pp. 3137-3145] which at 120 K is monoclinic with one mol-ecule in the asymmetric unit. Both mol-ecules in the title compound are in the trans form. In the crystal, N-H⋯O and O-H⋯O hydrogen bonds connect mol-ecules, forming a two-dimensional network parallel to (001).

A new polymorph of 1-({[1,3-dihydroxy-2-(hydroxymethyl)propan-2-yl]iminio}methyl)naphthalen-2-olate