Analysis of the contributions of 13C–1H dipolar interactions to the 13C n.m.r. spin-lattice relaxation times of the quaternary carbons of 1-methylisoguanosine establishes that the predominant tautomer in solution is the 2-keto, 6-amino form.
R. S. Norton, R. P. Gregson and R. J. Quinn, J. Chem. Soc., Chem. Commun., 1980, 339 DOI: 10.1039/C39800000339
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