COC(=O)C(NC(=O)OC1C(=O)c2cc(Br)ccc2OC1c1cccc(OC)c1)C(C)C
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?