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The title Schiff base, C 17 H 14 N 2 O 3 , exists as an NH tautomer with the H atom of the phenol group transferred to the imine N atom. The iminium H atom is involved in a strong intra­molecular N + —H⋯O −  hydrogen bond to the phenolate O atom, forming an  S (6) motif. In the crystal structure, N—H⋯O hydrogen bonds form a  C (9) chain parallel to [100] and a  C (11) chain parallel to [010], while C—H⋯O hydrogen bonds form a  C (11) chain parallel to [010]. The combination of N—H⋯O and C—H⋯O hydrogen bonds generates  R43 (30) rings parallel to the  ab  plane

8-[(1E)-1-(2-Aminophenyliminio)ethyl]-2-oxo-2H-chromen-7-olate