O=C(Nc1ccc(N2C(=O)c3cccc4cccc(c34)C2=O)cc1)c1ccc(N2CCCCC2)c([N+](=O)[O-])c1
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?