The Publisher regrets that this article is an accidental duplication of an article that has already been published, doi:10.1016/S0370-2693(09)01341-0. The duplicate article has therefore been withdrawn
Publisher's Note added on 29 September 2008: There is a pagination error in the Int. J. Mol. Sci. 2008, 9(5) with page 905 missing. Thus, page 905 is taken as a blank page
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