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In the title mol­ecule, C 16 H 16 N 2 O 3 , intra­molecular O—H⋯O hydrogen bonds influence the mol­ecular conformation. Inter­molecular O—H⋯O hydrogen bonds [O⋯O = 2.922 (2) Å] link the mol­ecules into centrosymmetric dimers. Weak inter­molecular C—H⋯O inter­actions assemble these dimers into layers parallel to the  bc  plane.

5-Hydroxy-1-(3-hydroxy-2-naphthoyl)-3,5-dimethyl-2-pyrazoline