Cc1cc(=O)n2c(C(=O)Nc3ccc(Br)cc3)c(C(=O)Nc3ccccc3)sc2n1
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?