Ic1ccc2c(c1)N(c1ccccc1)c1cc([N-]c3ccc4nc5ccc(I)cc5[n+](-c5ccccc5)c4c3)ccc1N2
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?