CCCCCCCCCCCCCCCCP(=O)([O-])OP(=O)(O)OCC1OC(n2cnc3c(N)ncnc32)C(O)C1O.[Na+]
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?