O=c1cc(-c2nc3ccccc3[nH]2)[nH]c2nc(-c3nc4ccccc4[nH]3)cc(-c3ccc(Cl)cc3)c12
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?