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Sharma N, Hu Z, Crowder MW, Bennett B.Sharma N, et al.J Am Chem Soc. 2008 Jul 2;130(26):8215-22. doi: 10.1021/ja0774562. Epub 2008 Jun 4.J Am Chem Soc. 2008.PMID: 18528987Free PMC article.