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The position‐specific 15N isotope content in organic molecules, at natural abundance, is for the first time determined by using a quantitative methodology based on 15N Nuclear Magnetic Resonance (NMR) spectrometry. 15N NMR spectra are obtained by using an adiabatic “Full‐Spectrum” INEPT sequence in order to make possible 15N NMR experiments with a high signal‐to‐noise ratio (>500), to reach a precision...