Clc1ccc(-c2ccc(-c3nnc(COc4ccc(OCc5nnc(-c6ccc(-c7ccc(Cl)cc7Cl)o6)o5)c(Cl)c4)o3)o2)c(Cl)c1
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?