ISSN:
1600-5759
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The title compound, [2aS-(2aα,4aα,5α,7bα)]-5-(β-D-glucopyranosyloxy)-2a,4a,5,7b-tetrahydro-1-oxo-1H-2,6-dioxacyclopent[cd]inden-4-ylmethyl acetate monohydrate, C18H22O11·H2O, was extracted from the Turkish plant Putoria calabrica (L. fil.) DC. The three fused rings have envelope or distorted envelope conformations and form a bowl in which ring strain causes distortion of some bond angles and significant pyramidalization of two of the Csp2 atoms. The ring junction H atoms are all cis to one another and the glycosidic linkage is in the β axial position. The structure incorporates two symmetry-independent water molecules, each of which is located on a twofold axis. Intermolecular hydrogen bonds involving all the hydroxy groups and water molecules link the molecules into a complex three-dimensional framework.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108270100003292
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