Cc1nn(Cc2c(Cl)cccc2Cl)c(C)c1NC(=O)Cn1nc([N+](=O)[O-])c(Cl)c1C
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?