CNc1ncnc2c1ncn2[C@H]1C[C@H](OP(=O)([O-])[O-])[C@@H](COP(=O)([O-])[O-])O1.[Na+].[Na+].[Na+].[Na+]
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?