O=C1c2ccccc2C(=O)C12OC(c1ccccc1)C1(C(=O)c3ccccc3C1=O)C2c1cccc([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?