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The file "Diels_alder1.gif" has 2 identical duplications.

1. Diels alder1.gif . . St408 (talk | contribs) . . 17:04, 24 January 2011
2. Diels alder reaction.jpg . . Fs1309 (talk | contribs) . . 11:34, 14 October 2011
3. NBendo-exo.jpeg . . Nb2212 (talk | contribs) . . 12:52, 22 February 2015