CCc1c(C)c(C#N)c2nc3ccccc3n2c1Nc1c(C)n(C)n(-c2ccccc2)c1=O
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?