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Figure 2 Sphere models of the crystal structures of 6,8-di­chloro-4-oxochromene-3-carbaldehyde (A, Ishikawa & Motohashi, 2013), 6-chloro-4-oxo-4H-chromene-3-carbaldehyde (B, Ishikawa, 2014a), 8-chloro-4-oxo-4H-chromene-3-carbaldehyde (C, Ishikawa, 2014b), and the title compound (D).

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