Ontology highlight
ABSTRACT:
SUBMITTER: Mohamed SK
PROVIDER: S-EPMC3629652 | biostudies-literature | 2013 Apr
REPOSITORIES: biostudies-literature
Acta crystallographica. Section E, Structure reports online 20130328 Pt 4
In the xanthene ring system in the title compound, C19H18O4, the 4H-pyran ring has a maximum deviation of 0.110 (2) Å from planarity and the cyclo-hexene ring exhibits a puckered conformation [puckering parameters Q T = 0.452 (3) Å, θ = 57.0 (4) and ϕ = 131.7 (4)°]. The cyclo-hexene ring attached to the xanthene system adopts an envelope conformation, with the middle of the three methylene C atoms as the flap atom. In the crystal, O-H⋯O and C-H⋯O hydrogen bonds form infinite chains of R 1 (2)(6) ...[more]