CC(C)Cn1cnc2c1c(=O)n(CC(=O)NC(=O)NC(C)(C)C)c(=O)n2Cc1ccccc1
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?