O=C(O)c1ccc(CSc2nc3ccc(N4C(=O)C5C6C=CC(C6)C5C4=O)cc3s2)cc1
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?