Add time:08/10/2019         Source:sciencedirect.com

N-Acetoxyderivatives of 3-hydroxyxanthine and several of its methyl derivatives of 1-hydroxyxanthine, and of 8-aza-3-hydroxyxanthine are described. The UV spectra of the 7 or 9-acetyl derivatives of 1- and 3-N-acetoxyxanthines indicate the presence of intramolecular H-bonding which influences the tautomeric structures.

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