Three different crystals of 9-ethyl-8-hydroxyguanine have been analysed by X-ray diffraction. Extensive ‘cyclic’ hydrogen bonds were formed among the bases related by pseudo-2-fold symmetry. The bonding parameters suggested that the 8-hydroxyguanine base consists of a predominant 2-amino-6,8-dioxo isomer (diketo form) including some tautomers.
M. Doi, Y. In, M. Kikuchi, T. Ishida and M. Inoue, J. Chem. Soc., Perkin Trans. 1, 1991, 55 DOI: 10.1039/P19910000055
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