COC(=O)C(=O)C(C(=O)C(=O)Nc1ccccc1C(N)=O)c1nc2ccc([N+](=O)[O-])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?