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Jaromír TOUŠEK and
Radek MAREK. The studies of tautomerism in 6-mercaptopurine derivatives by 1H-13C, 1H-15N NMR and 13C, 15N CP/MAS-experimental and quantum chemical approach.
Journal of Molecular Structure. Amsterdam: Elsevier, 2006, vol. 785, No 1, p. 205-215. ISSN 0022-2860.