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. 2023 Jun 17;10(Pt 4):448–463. doi: 10.1107/S2052252523004281

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© Federica Bravetti et al. 2023

This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

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Overlays of the ¹⁵N (60.8 MHz) CPMAS (12 kHz) spectra at room temperature of leucopterin hemihydrate and anhydrate acquired with different contact times to highlight signals due to protonated and non-protonated N-atom sites. Top: hemihydrate, acquired with contact times of 0.1 (red) or 4 ms (black); bottom: anhydrate, acquired with contact times of 0.1 (red) or 4 ms (black).