Note on explicit hydrogens and RKit library
===========================================

.. warning::

    Many RDKit functions, including the ``sascore``, operate optimally when applied to molecules without explicit hydrogens. The ``sascore`` assigns a score ranging from 1 to 13, where 1 indicates an easily synthesizable molecule, and 13 signifies a challenging one. However, when explicit hydrogens are present, the function tends to yield higher scores, incorrectly suggesting a greater difficulty of synthesis. Detailed discussions on this issue can be found at `SA_Score gives different values depending if the molecule has explicit hydrogens <https://github.com/rdkit/rdkit/discussions/7047>`__.

    The moldrug-3.7.0 release has addressed this concern for all built-in fitness functions. Refer to `moldrug's CHANGELOG <https://moldrug.readthedocs.io/en/latest/source/CHANGELOG.html>`__ for a comprehensive overview of the fixes and improvements.