title: tert-Butyl 6-benzoyl-5-hydr-oxy-2-oxo-2H-chromene-4-carboxyl-ate.
abstract: In the title compound, C(21)H(18)O(6), a previously unknown coumarin derivative, the benzoyl substitutent makes a dihedral angle of 53.80 (16)° with the plane of the coumarin rings. An intramolecular O-H⋯O hydrogen bond is observed.
authors.affiliation: Department of Chemistry, University of Mazandaran, 47415, Babolsar, Iran.
authors.forename: Robabeh
authors.initials: R
authors.lastname: Baharfar
authors.forename: S Mohammad
authors.initials: SM
authors.lastname: Vahdat
authors.forename: S Meysam
authors.initials: SM
authors.lastname: Baghbanian