A Caltech Library Service

Avicennin: hypersymmetry in space group P1

Lai, Ting Fong and Marsh, Richard E. (1974) Avicennin: hypersymmetry in space group P1. Acta crystallographica. Section B, Structural science, B30 (6). pp. 1570-1575. ISSN 0108-7681. doi:10.1107/S0567740874005280.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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].

Item Type:Article
Related URLs:
URLURL TypeDescription
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.
Funding AgencyGrant Number
NIHGM 16966
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Arthur Amos Noyes Laboratory of Chemical Physics4820
Issue or Number:6
Record Number:CaltechAUTHORS:20170317-151311629
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75219
Deposited By: George Porter
Deposited On:17 Mar 2017 22:56
Last Modified:15 Nov 2021 16:31

Repository Staff Only: item control page