Cl.NCCCCC(NC(=O)C(N)Cc1ccc(O)cc1)C(=O)NC(CCCCN)C(=O)NC(CCCCN)C(=O)ON1C(=O)CCC1=O
Heavy atom refers to any atom that is not hydrogen. The heavy atoms in molecules are carbon, oxygen, nitrogen, and sulfur. How many heavy atoms are in the molecule?