O=C1/C(=C/c2cccc([N+](=O)[O-])c2)N=C(c2ccccc2)N1c1nc2ccc(Sc3ccccc3)cc2[nH]1
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?