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A. Schematic representation of the nucleosidic substructure used as query by the script, in the form of SMARTS string. Six substructures are searched, involving three possibilities for the ribose-like ring (identified by three different colors in the image) combined to a purine-like or pyrimidine-like scaffold. B. Schematic representation of the dihedral angles ν0, ν1, ν2, ν3, ν4.
