title: Crystal structure of a photobiologically active furan-ocoumarin from Artemisia reticulata.
abstract: The title furan-ocoumarin, C14H12O4 [systematic name: 9-hy-droxy-2-(prop-1-en-2-yl)-2,3-di-hydro-7H-furo[3,2-g]chromen-7-one], crystallizes with two independent mol-ecules (A and B) in the asymmetric unit. The two mol-ecules differ essentially in the orientation of the propenyl group with respect to the mean plane of the furan-ocoumarin moiety; the O-C(H)-C=C torsion angle is 122.2 (7)° in mol-ecule A and -10.8 (11)° in mol-ecule B. In the crystal, the A and B mol-ecules are linked via O-H⋯O hydrogen bonds, forming zigzag -A-B-A-B- chains propagating along [001]. The chains are reinforced by bifurcated C-H⋯(O,O) hydrogen bonds, forming ribbons which are linked via C-H⋯π and π-π inter-actions [inter-centroid distance = 3.602 (2) Å], forming a three-dimensional structure.
authors.affiliation: Bioorganic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Bauri
authors.affiliation: Clemens Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Petersenstrasse 22, D-64287 Darmstadt, Germany.
authors.forename: Sabine
authors.initials: S
authors.lastname: Foro
authors.affiliation: Accident & Emergency Department, Franco, Vietnamese Hospital, 7-Nguyen, Luong Bang Street, HoChiMinh City, Vietnam.
authors.forename: Nhu Quynh
authors.initials: NQ
authors.lastname: Nguyen Do
keywords: Artemisia reticulata; crystal structure; furan­ocoumarin; hydrogen bonding; oroselone; photobiological property