Assertion: adenine | /r/CapableOf | afford different protonation states
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text: The neutral 9HAde compound was fitted with the model described, with the components A, B, and C to be at binding energies of 398.49, 399.14, and 400.06 eV, respectively ( As previously mentioned, adenine can afford different protonation states, and it is often very challenging to accurately observe the presence of H atoms by elemental analysis or SCXRD.