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ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, vol.60, 2004 (SCI-Expanded)
The title molecule, C21H19NO3, consists of three essentially planar fragments. There is negligible puckering in the cyclobutane ring. The crystal structure is stabilized not only by weak intermolecular C-H...O hydrogen-bond interactions but also by weak C-H...pi(ring) interactions, with an H...Cg distance of 2.85 Angstrom (where Cg is the centroid of the phthalimido six-membered ring).