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The title compound, C 18 H 13 NO 2 S, has two independent mol­ecules ( A  and  B ) with similar conformations in the asymmetric unit. Both phenothia­zine moieties have a butterfly structure [dihedral angles between benzene rings = 155.17 (7) and 161.71 (7)°, respectively], and the central six-membered rings have a boat form. In the crystal, the  A  and  B  mol­ecules stack alternately along the  b  axis. The  A  and  B  mol­ecules are linked by O—H⋯O=S hydrogen bonds, forming zigzag chains along [10-1].

10-(6-Hydroxyhexa-2,4-diyn-1-yl)-10H-phenothiazine 5-oxide