COC(=O)C1=C(C(=O)OC)N(c2ccc(OC)cc2[N+](=O)[O-])C(c2ccc(C)cc2)=CC1c1ccc(OC)cc1OC
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?