O=C1NC[C@H](Cc2ccccc2)N(C[C@H]2CCCN2C[C@H](Cc2ccccc2)N2C[C@H](Cc3ccccc3)N(CCc3ccccc3)C(=O)C2=O)C1=O
All atoms other than hydrogen are referred to be heavy atoms. How many heavy atoms are there in the molecule?