O=C(CN1CCN(C(=O)OCc2ccccc2)CCN(CC(=O)N2CCCCC2)CCN(C(=O)OCc2ccccc2)CC1)N1CCCCC1
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?