code: def check_chemical_validity(mol):
      """
      Check the chemical validity of the mol object. Existing mol object is
      not modified. Radicals pass this test.
  
      Args:
          mol: Rdkit mol object
  
      :rtype:
          :class:`bool`, True if chemically valid, False otherwise
      """
  
      s = Chem.MolToSmiles(mol, isomericSmiles=True)
      m = Chem.MolFromSmiles(s)  # implicitly performs sanitization
      if m:
          return True
      else:
          return False
  
file_path: DIG/dig/ggraph/utils/environment.py
imports: import copy
  import itertools
  import networkx
  from rdkit import Chem, DataStructs
  from rdkit.Chem import AllChem, rdMolDescriptors
  from rdkit.Chem.Descriptors import MolLogP, qed
  from rdkit.Chem.FilterCatalog import FilterCatalogParams, FilterCatalog
  from .sascorer import calculateScore
label_desc: Use image node_id 2 for calling a global function with example usage: check_chemical_validity(mol) and returns: True, False