Cc1c2c(n(C)c1C)C(=O)C1C(C2=O)C2(C)c3ccccc3C1(C)c1ccccc12
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?