CC1(C)Cc2cccc(OCC(=O)OCc3nnc(-c4ccc([N+](=O)[O-])cc4)o3)c2O1
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?