title: Crystal structure of natural phaeosphaeride A.
abstract: The asymmetric unit of the title compound, C15H23NO5, contains two independent mol-ecules. Phaeosphaeride A contains two primary sections, an alkyl chain consisting of five C atoms and a cyclic system consisting of fused five- and six-membered rings with attached substituents. In the crystal, the mol-ecules form layered structures. Nearly planar sheets, parallel to the (001) plane, form bilayers of two-dimensional hydrogen-bonded networks with the hy-droxy groups located on the inter-ior of the bilayer sheets. The network is constructed primarily of four O-H⋯O hydrogen bonds, which form a zigzag pattern in the (001) plane. The butyl chains inter-digitate with the butyl chains on adjacent sheets. The crystal was twinned by a twofold rotation about the c axis, with refined major-minor occupancy fractions of 0.718 (6):0.282 (6).
authors.affiliation: Chemical Modeling Laboratory, Research Institute of Hygiene, Occupational Pathology and Human Ecology, Medical Biological Agency, p/o Kuz'molovsky, Saint Petersburg, 188663, Russian Federation.
authors.forename: Victoria V
authors.initials: VV
authors.lastname: Abzianidze
authors.affiliation: All-Russian Institute of Plant Protection, Russian Academy of Agricultural Sciences, Pushkin, Saint Petersburg, 196608, Russian Federation.
authors.forename: Ekaterina V
authors.initials: EV
authors.lastname: Poluektova
authors.affiliation: All-Russian Institute of Plant Protection, Russian Academy of Agricultural Sciences, Pushkin, Saint Petersburg, 196608, Russian Federation.
authors.forename: Ksenia P
authors.initials: KP
authors.lastname: Bolshakova
authors.affiliation: Department of Crystallography, Institute of Earth Sciences, Saint Petersburg State University, University Emb., 7/9, Saint Petersburg, 199034, Russian Federation.
authors.forename: Taras L
authors.initials: TL
authors.lastname: Panikorovskii
authors.affiliation: Department of Organic Chemistry, Institute of Chemistry, Saint Petersburg State University, University Emb., 26, Saint Petersburg, 198504, Russian Federation.
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Bogachenkov
authors.affiliation: All-Russian Institute of Plant Protection, Russian Academy of Agricultural Sciences, Pushkin, Saint Petersburg, 196608, Russian Federation.
authors.forename: Alexander O
authors.initials: AO
authors.lastname: Berestetskiy
keywords: crystal structure; natural phaeosphaeride A