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Crystallographic data for the structural analysis have
been deposited with the Cambridge Crystallographic
Data Centre, CCDC nos. 157800 and 157801 for com-
pounds 2b and 3b. Copies of this information may be
obtained from The Director, CCDC, 12 Union Road,
Cambridge CB2 1EZ, UK (fax: +44-1233-336-033;
e-mail: deposit@ccdc.cam.ac.uk or www: http://
www.ccdc.cam.ac.uk).
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Acknowledgements
We thank the Ministerio de Educacio´n y Cultura and
the Ministerio de Ciencia y Tecnolog´ıa of Spain and to
the Generalitat de Catalunya for financial support
(grants: PB98-1236, BQU2000-0652 and 1997-SGR-
044).
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