CC(=O)OCC1=C(C(=O)[O-])N2C(=O)C(NC(=O)CSc3ccncc3)C2SC1.[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?