O=C1CN(C(=O)c2ccc(S(=O)(=O)N3CCCC3)cc2)C(c2ccccc2)c2cc(Br)ccc2N1
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?