Published June 1974
| Published
Journal Article
Open
Avicennin: hypersymmetry in space group P1
- Creators
- Lai, Ting Fong
- Marsh, Richard E.
Chicago
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Abstract
Triclinic, 1i, a= 11.209 (1), b= 10.196 (2), c=9.634 (2) Å, α = 82.76 (2), β = 109.43 (1), γ = 123.61 (1)°, Z=2; C_(20)H_(20)O_4, F. W. 324.38, D_m = 1.25, D_x = 1.249 g cm^(-3). The molecular structure is found to be based on a coumarin system fused at the 5,6 positions to an α-pyran ring. The structure was solved by Patterson methods; failure of direct phasing methods can be traced to an 'aberrant phase relationship' due to the hypersymmetry of the molecule, as discussed by Thiessen & Busing [Abs. Amer. Cryst. Assoc. (1973). Storrs, Connecticut, paper N-12, p. 183].
Additional Information
© 1974 International Union of Crystallography. (Received 30 January 1974; accepted 21 February 1974) This investigation was supported in part by Public Health Service Research Grant No. GM 16966, from the National Institute of General Medical Sciences, National Institutes of Health. We are grateful to Dr David Duchamp for calculating the molecular transform, to Miss Lillian Casler for preparing most of the figures, and to Miss Allison Kimball for preparing the manuscript.Attached Files
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Additional details
- Eprint ID
- 75219
- Resolver ID
- CaltechAUTHORS:20170317-151311629
- NIH
- GM 16966
- Created
-
2017-03-17Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field
- Other Numbering System Name
- Arthur Amos Noyes Laboratory of Chemical Physics
- Other Numbering System Identifier
- 4820