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What about monomethyl xanthines? Surely they play some important part in the human metabolism of di- and tri- metyhlxanthines. Fuzzform (talk) 05:49, 19 November 2008 (UTC) i dont know what the hell is this —Preceding unsigned comment added by 18.104.22.168 (talk) 21:24, 29 January 2009 (UTC)
The link to CAS in the chembox shows another tautomere as Xanthine. I think the tautomere on the Common Chemistry page is better, as it shows how Xanthine relates to Caffeine for example, just by changing the substituents. --22.214.171.124 (talk) 17:52, 1 November 2010 (UTC)
This file, correctly show a hydrogen bonded to a nitrogen at 9', but this picture, , which is on the xanthine page, shows the hydrogen at 7'. This image of xanthine also appears wrong: . Also one of the bonds is in a different location. In addition, the xanthosine image, , also correctly has a hydrogen bonded to the nitrogen at 9' prime in order to connect with the ribose. According to this site: http://www.pearsonhighered.com/mathews/ch22/xanthine.htm the xanthosine picture is correct. Does anyone else agree that both pictures on the xanthine page should be changed? Kittenono (talk) 18:03, 4 July 2011 (UTC)