Nc1ncnc2c1nc(Br)n2[C@@H]1O[C@H]2COP(=O)([O-])O[C@@H]2[C@H]1O.[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?