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In the title compound, C 21 H 15 Cl 2 NO 2 , the H atom of the –OH group is transferred to the N atom of the imine, forming a zwitterion. Thus, there is formation of a six-membered ring  via  an intra­molecular O⋯H—N, rather than O—H⋯N, hydrogen bond in the mol­ecule. The dihedral angle between the naphthalene ring system and the benzene ring of the 2 H -chromen system is 87.41 (4)°. In the crystal, the mol­ecules are packed through N—H⋯O, π–π [centroid–centroid distances = 3.744 (3) and 3.780 (3) Å], C—Cl⋯π [Cl⋯centroid = 3.261 (3) Å], C—H⋯π and C—H⋯O inter­actions.

(E)-6,8-Dichloro-3-{[(naphthalen-1-ylmethyl)iminiumyl]methyl}-2H-chromen-4-olate