Nc1nc(/C(=C/CC(=O)O)C(=O)NC2C(=O)N3C(C(=O)O)=CCSC23)cs1
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?