COc1cc(-c2nc(S(=O)(=O)c3ccc(Br)cc3)c(N3CCOCC3)o2)cc(OC)c1OC
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?