COC(=O)C(=O)C(C(=O)C(=O)Nc1ccc([N+](=O)[O-])cc1[N+](=O)[O-])c1nc2ccc(Cl)cc2nc1O
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?