COc1cc(/C=C2/C(=O)c3cccc([N+](=O)[O-])c3C2=O)c(Br)cc1O
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?