CC(C)(C)c1cc(C#N)c2c(c1)C(=O)OC2(c1ccccc1)c1ccccc1C#N
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?