CC(C)C1OC(=O)C(Cc2ccccc2)N(C)C(=O)C(C(C)C)OC(=O)C(Cc2ccccc2)N(C)C(=O)C(C(C)C)OC(=O)C(Cc2ccccc2)N(C)C1=O
All atoms other than hydrogen are referred to be heavy atoms. How many heavy atoms are there in the molecule?