Abstract
The title compound, C17H17NO3, crystallizes with four independent molecules (A, B, C and D) in the asymmetric unit. The independent molecules exist as pseudo-inversion-related pairs (A/B and C/D). The A/B set form sheets parallel to the bc plane, and the C/D set stack alternately in sheets, oblique to the ac plane along the b axis. The crystal packing is stabilized by an extensive array of C—H⋯O intermolecular hydrogen-bonding interactions, linking the inversion-related pairs in inversion-related stacks, as well as by π–π stacking interactions between the pyrano rings [A/B and C/D; 3.4738 (15) and 3.6424 (16) A] and benzo rings [A/A, B/B, C/C and D/D; 3.6142 (15), 3.6152 (16), 3.6442 (16) and 3.6682 (16) A] and between the pyrano and benzo rings [D/D; 3.9704 (16) A] of the independent molecules. The two six-membered rings within the quinolizine group of the A/B and C/D molecules adopt envelope and half-chair conformations, respectively.
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