NCC1O[C@@H](OC2C(N)C[C@H](N)[C@@H](O[C@H]3OC(CO)C(O)C(N)C3O)C2O)C(N)C(O)C1O
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?