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The title compound, C17H22O3, which was synthesized by the condensation of cyclo­hexane-1,3-dione and n-valer­aldehyde, includes a partially hydrogenated xanthene ring system. The mol­ecule has crystallographic mirror symmetry. The central ring adopts a very shallow boat conformation while the symmetry-related outer six-membered rings have sofa conformations. Molecules form extended tapes in the c-axis direction though weak C—H...O interactions.

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The 2-amino-4,6-diphenyl-4H-1,3-oxazinium trifluoro­acetate ion pairs in the title compound, C16H15N2O+·C2F3O2, are held together by two N—H...O hydrogen bonds [Namino—H...O and Noxazinium—H...O], and adjacent ion pairs are linked into helical chains by a third and substantially weaker Namino—H...O hydrogen bond.
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