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In the title phenanthrenone compound, C(18)H(13)NO(2)S, the dihydro-phenanthrene ring system is not planar, with its central ring distorted to a screw-boat conformation. The essentially planar thia-zole ring [maximum deviation = 0.005 (1) Å] is inclined at an inter-planar angle of 23.36 (5)° with respect to the mean plane through the dihydro-phenanthrene ring system. In the crystal packing, inter-molecular O-H⋯N hydrogen bonds link the mol-ecules into infinite chains along the a axis. Weak inter-molecular C-H⋯π inter-actions further stabilize the crystal packing.

10-Hydroxy-10-(1,3-thiazol-2-ylmethyl)phenanthren-9(10H)-one