The `CalcExactMolWt` function in the Python RDKit library, specifically in the `rdkit.Chem.AllChem` module, is used to calculate the exact molecular weight of a given molecule. It takes as input a molecule object and returns the exact mass of the molecule. The molecular weight is calculated by summing the atomic masses of all the atoms present in the molecule, including hydrogen isotopes and isotopes of other elements. This function is particularly useful in various cheminformatics and drug discovery applications where the precise molecular weight of a compound is required for further analysis or comparisons.
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