Acta Cryst. (2008). E64, o913 [ doi:10.1107/S1600536808011185 ]
Abstract: The title Schiff base, C17H15N3O3, exists in the zwitterionic form with the phenol H atom transferred to the imine group. Adjacent zwitterions are linked into a linear chain running along the a axis by an indole-hydroxy N-HO hydrogen bond [3.100 (2) Å].
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