Oc1c(Br)cc(CN(Cc2cc(Br)c(O)c(Br)c2)C2CCCCC2)cc1Br
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?