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In the title compound, C18H16N2O2, the hy­droxy­ethanimine group is essentially coplanar with the ring to which it is attached (C—C—N—O torsion angle = −176.9°). Mol­ecules are linked into cyclic centrosymmetric R 2 2(6) dimers via O—H⋯N hydrogen bonds.

In the title salt, C8H10N+·H2PO4 −, the cation is essentially planar (r.m.s. deviation = 0.063 Å). In the crystal, the phosphate anions form inversion R 2 2(8) dimers via pairs of O—H⋯O hydrogen bonds. These dimers are further linked by pairs of O—H⋯O hydrogen bonds, also enclosing R 2 2(8) loops, forming chains running along [001]. The cations are bonded to the anions via N—H⋯O hydrogen bonds and C—H⋯O contacts.

Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.003 Å; R factor = 0.045; wR factor = 0.133; data-to-parameter ratio = 14.6.In the title compound, C 28 H 22 O 6 , the chromeno ring system is almost planar, with a dihedral angle between the mean planes of the pyran and benzene rings of 1.87 (8) . The pyran ring bearing the methylphenyl substituent has a half-chair conformation while the other pyran ring has an envelope conformation with the tetrasubstituted C atom as the flap. The benzene ring of the chromeno ring system is inclined to the benzene ring fused to the latter pyran ring by 74.66 (9) . These aromatic rings are inclined to the 4-methylphenyl ring by 52.67 (9) and 66.63 (10) , respectively. In the crystal, molecules are linked via C-HÁ Á ÁO hydrogen bonds, forming a two-dimensional network parallel to the bc plane. Related literature