COC(=O)C(=O)C(C(=O)C(=O)Nc1cc(Cl)c(Cl)cc1Cl)c1nc2ccc([N+](=O)[O-])cc2nc1O
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?