O=C(/C=C/c1ccc(C(F)(F)F)cc1)c1c([O-])on[n+]1-c1ccccc1
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?