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In the title compound, C21H14N2O2S, a donor-acceptor type of benzo[b]pheno-thia-zine (bpz) derivative, the thia-zine ring adopts a boat conformation and the bond-angle sum at the N atom is 360.0°. The dihedral angle between the benzene ring and the naphthelene ring system fused to the thia-zine ring is 32.76 (5)°. In the crystal, carb-oxy-lic-acid inversion dimers linked by pairs of O-H⋯O hydrogen bonds generate R 2 (2)(8) loops. Aromatic π-π stacking [shortest centroid-centroid separaton = 3.5242 (13)Å] consolidates the structure and very weak C-H⋯O and C-H⋯N inter-actions also occur.

Crystal structure of (E)-2-cyano-3-(12-methyl-12H-benzo[b]phenothiazin-11-yl)acrylic acid