O=C(Nc1cc(Cl)c(Cl)cc1Cl)C(=O)C(C(=O)c1ccc(Cl)c(Cl)c1)C1OC(=O)c2ccccc21
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?