[O-][n+]1onc(-c2ccccc2)c1-c1no[n+]([O-])c1-c1c(-c2ccccc2)no[n+]1[O-]
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?