COC(=O)c1c(C(=O)OC)c2ccccn2c1-c1cc(OC)c(Br)c(=O)o1
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?