title: Crystal structure of methyl 2-(7-hy-droxy-2-oxo-2H-chromen-4-yl)acetate.
abstract: In the title coumarin derivative, C12H10O5, the fused ring system is almost planar (r.m.s deviation = 0.016 Å). The Car-C-C=O torsion angle of the side chain is -8.4 (2)° In the crystal, mol-ecules are linked by O-H⋯O hydrogen bonds, generating C(8) chains propagating in the [100] direction. The chains are cross-linked by weak C-H⋯O inter-actions, thereby generating undulating (001) sheets.
authors.affiliation: H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan.
authors.forename: Sammer
authors.initials: S
authors.lastname: Yousuf
authors.affiliation: Department of Chemistry, Karakoram International University, Gilgit, Pakistan.
authors.forename: Shafqat
authors.initials: S
authors.lastname: Hussain
authors.affiliation: H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan.
authors.forename: Khalid Mohammed
authors.initials: KM
authors.lastname: Khan
authors.affiliation: H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Shabeer
authors.affiliation: PCSIR Laboratories, Karachi, Pakistan.
authors.forename: Shahnaz
authors.initials: S
authors.lastname: Perveen
keywords: chromene; coumarin; crystal structure; ester; hydrogen bonding