CCN1C(=O)C(=CNc2ccc(N3CCOCC3)c(Br)c2)C(=O)N(CC)C1=S
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?