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A view of the C–H···O hydrogen bonds (dotted lines) in the crystal structure of the title compound. [Symmter codes: (i) - x + 1, y + 1/2 , - z + 1/2; (ii) - x, y + 1/2, - z + 1/2; (iii) - x + 1, y - 1/2, - z + 1/2; (iv) - x , y -1/2, - z -1/2.]