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I found patent EP 2155766 A1 while looking at Ru mediators. I also found this paper, published April 2008, 3 months before the filing date.

Does this invalidate the patent?

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The patent document you cite is an application, not a granted European patent. The U.S. counterpart is 2011/0262950. It received a non final rejection that was responded to in April 2013. I do not see the paper you cite listed by the applicant or the examiner but there is a paper by Chen et al in 1985 in Inorganic Chemistry used to reject many of the claims. I found this information in the publicly available database - USPTO Public PAIR. I do not know enough chemistry to comment on the substance.

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