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Figure 2
Chemical diagrams showing the templates used to perform the CSD searches: (a) and (b) were used for the six-membered ring series, while (d) and (e) were used to search for five-membered ring examples. Structures fitting the template shown in (c) were not considered in this study. Atoms not indicated are `any atom', while dashed bond lines indicate `any bond'. R = any non-H atom.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 60| Part 6| November 2004| Pages 748-754
doi:10.1107/S0108768104023791
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