O=C(n1c(=O)n(-c2ccc(Cl)cc2)c(=O)n1C(=O)C(Cl)(Cl)Cl)C(Cl)(Cl)Cl
Aromatic rings (also known as aromatic compounds or arenes) are hydrocarbons which contain benzene, or some other related ring structure. How many aromatic rings does the molecule contain?