Nc1nc(N)c2ncn(CC(CO)CC(c3ccccc3)P(=O)([O-])O)c2n1.[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?