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The title compound, C 20 H 18 O 3 , crystallizes in the space group P 2 1 / c with one mol-ecule in the asymmetric unit of the cell. The fluorene skeleton is nearly planar and the crystal structure is composed of mol-ecular layers extending parallel to the (302) plane. Within a layer, one formyl oxygen atom participates in the formation of a C arene -H⋯O bond, which is responsible for the formation of an inversion symmetric supra-molecular motif of graph set R  2  2 (10). A second oxygen atom is involved in an intra-molecular C arene -H⋯O hydrogen bond and is further connected with a formyl hydrogen atom of an adjacent mol-ecule. A Hirshfeld surface analysis indicated that the most important contributions to the overall surface are from H⋯H (46.9%), O⋯H (27.9%) and C⋯H (17.8%) inter-actions.

Crystal structure of 9,9-diethyl-9H-fluorene-2,4,7-tricarbaldehyde