L. Vijayalakshmi et al., Piperidinium 3-[(4-hydroxy-5,7-dimethyl-2-oxo-2H-chromen-3-yl)-phenylmethyl]-5,7-dimethyl-2-oxo-2H-chromen-4-olate, ACT CRYST C, 57, 2001, pp. 817-818
In the title salt, C5H12N+.C29H23O6-, both benzopyran systems are planar. I
ntermolecular N-H . . .O hydrogen bonds and a short O-H . . .O intramolecul
ar hydrogen bond are observed in the structure.