Unusual ring conformation identified by Mogul. Mogul finds similar ring and works out the
            rmsd deviation of the ring torsion angles compared to the CSD similar rings.
            Each ring involves five or six atoms.
            The Mogul software (Bruno et al., 2004) works by comparing the ligand geometry
            with preferred molecular geometries derived from high-quality, small-molecule structures in 
            the Cambridge Structural pdbx_vrpt_database (CSD).