O=c1oc2ccc([N+](=O)[O-])cc2c(Nc2ccc3c(c2)S(=O)(=O)c2ccccc2O3)c1[N+](=O)[O-]
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?