COC(=O)[C@H](CO)n1cc(-c2cc(C(=O)N3CCN(C(=O)OC(C)(C)C)CC3)cc(-c3cn([C@@H](CCC(=O)OC(C)(C)C)C(=O)OC(C)(C)C)nn3)c2)nn1
Heavy atom refers to any atom that is not hydrogen. How many heavy atoms do the molecule have?