11β,13-Dihydro-lactucin-8-O-acetate hemihydrate

Chris F Fronczek; Marco L Gomez-Barrios; Nikolaus H Fischer; Frank R Fronczek

doi:10.1107/S160053680903829X

11β,13-Dihydro-lactucin-8-O-acetate hemihydrate

Acta Crystallogr Sect E Struct Rep Online. 2009 Sep 30;65(Pt 10):o2564-5. doi: 10.1107/S160053680903829X.

Authors

Chris F Fronczek¹, Marco L Gomez-Barrios, Nikolaus H Fischer, Frank R Fronczek

Affiliation

¹ Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-1804, USA.

Abstract

THE TITLE STRUCTURE (SYSTEMATIC NAME: 9-hydroxy-methyl-3,6-di-methyl-3-methyl-ene-2,7-dioxo-3,3a,4,5,9a,9b-hexa-hydro-azu-leno[4,5-b]furan-4-yl acetate hemihydrate), C(17)H(20)O(6)·0.5H(2)O, from Lactuca floridana, has two independent sesquiterpene lactone mol-ecules in the asymmetric unit. Both have their seven-membered rings in the chair conformation. In the crystal, the OH groups and the water mol-ecule form classical O-H⋯O hydrogen bonds with O⋯O distances in the range 2.6750 (17)-2.8160 (18) Å.