C[C@@H](NC(=O)Nc1cccc(C(=O)Nc2cc(C(C)(C)C)ccc2C(=O)O)n1)c1ccccc1
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?