code: def valid_mol_can_with_seg(x, largest_connected_comp=True):
      # mol = None
      if x is None:
          return None
      sm = Chem.MolToSmiles(x, isomericSmiles=True)
      mol = Chem.MolFromSmiles(sm)
      if largest_connected_comp and "." in sm:
          vsm = [
              (s, len(s)) for s in sm.split(".")
          ]  # 'C.CC.CCc1ccc(N)cc1CCC=O'.split('.')
          vsm.sort(key=lambda tup: tup[1], reverse=True)
          mol = Chem.MolFromSmiles(vsm[0][0])
      return mol
  
imports: import re
  import numpy
  from rdkit import Chem
label_desc: Use image node_id 4 for calling a global function with example usage: valid_mol_can_with_seg(x, largest_connected_comp) and returns: mol, None