COc1ccc(N2C(=O)C3c4[nH]c5ccc(Br)cc5c4C4CCC(C(C)(C)C)CC4C3C2=O)cc1
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?