title: Ethyl 2-hydr-oxy-5-oxo-4-phenyl-2,3,4,5-tetra-hydro-pyrano[3,2-c]chromene-2-carboxyl-ate.
abstract: The main structural unit of the title compoud, C(21)H(18)O(6), is a fused three-ring group consisting of coumarin and tetra-hydro-pyrane ring systems. Two C atoms of the tetra-hydro-pyran ring are displaced by 0.295 (3) and -0.360 (2) Å from the mean plane of coumarin ring. The dihedral angle between the phenyl and coumarin rings is 73.94 (3)°. Inter-molecular O-H⋯O hydrogen bonds are present in the crystal structure.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Guangcun
authors.initials: G
authors.lastname: Zhang
authors.forename: Bailin
authors.initials: B
authors.lastname: Li
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Wang