CN(C(=O)c1ccc(NC(=O)Cc2cccc(NC(=O)C3CCCN(C(=O)CCc4ccccc4)C3)c2)cc1)C1CCCC1
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?