COc1cccc(NC(=O)CN(C)C(=O)c2cc(CN3C(=O)c4ccccc4C3=O)ccc2OC)c1
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?