CCOC(=O)NC(=O)c1cn(CCCCCCCCCCC(=O)N2CCN(CCn3cc(C(=O)NC(=O)OCC)c(=O)[nH]c3=O)CC2)c(=O)[nH]c1=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?