CC(C)(C)C1CCC2c3c([nH]c4ccccc34)C3C(=O)N(c4ccccc4)C(=O)C3C2C1
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?