HQSpectrum Update: Exchangeable Proton Selection

For molecules with exchangeable protons, such as ethanol, the calculated NMR parameters often include all protons by default.
In practice, these protons exchange with the solvent and do not appear in the experimental spectrum. You can now select which protons to include in the prediction.
This brings the simulated spectrum closer to what you actually measure in the lab and improves the fit between prediction and experiment.
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