code: def check_chemical_validity(mol):
      """
      Checks 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
  
imports: from rdkit import Chem
  import numpy
  import networkx
  import collections
  from collections import defaultdict
  import itertools
  import copy
  from scipy.spatial import distance_matrix
label_desc: Use image node_id 13 for calling a global function with example usage: check_chemical_validity(mol) and returns: True, False