COc1ccc2c(c1)C(=O)N1[C@H]3c4cc(Br)ccc4OC[C@@H]3[C@H](c3ccccc3)[C@]1(C)C(=O)N2
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?