CCc1ccc(CN(C)C(=O)CCc2nc3ccccc3n(-c3ccc(OC)cc3)c2=O)cc1
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?