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| The molar ratio of MSUM to xanthine | 2 : 1 | 1.5 : 1 | 1 : 1 | 1 : 2 | 0 |
| Chemical shifts of protons of C-8 (ppm)a | 7.394 | 7.388 | 7.385 | 7.383 | 7.372 |
NMR spectrum of 0.08 M xanthine in presence of diverse concentrations of MSUM at 45 °C in D2O (pH = 7.4, adjusted by NaOH).
