O=C1CN2C(c3ccccc3)=NN(c3ccc([N+](=O)[O-])cc3)C2(c2ccccc2)c2cc(Cl)ccc2N1CC1CC1
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?