O=C(C1=C(O)C(=O)N(CCCN2CCOCC2)C1c1ccc([N+](=O)[O-])cc1)c1ccc2c(c1)OCO2
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?