O=[N+]([O-])c1ccc(N2CCC(CCCC3CCN(c4ccc([N+](=O)[O-])cc4[N+](=O)[O-])CC3)CC2)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?