Cc1cc(Br)cc(C)c1NC(=O)C(=O)C1C(=O)C(CC2C(=O)c3ccccc3C2=O)C(=O)CC1(C)C
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?