CC(C)(C)c1cc(-c2csc(Nc3ccccc3)[n+]2Cc2ccc(C(=O)O)cc2)cc(C(C)(C)C)c1O.[Br-]
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?