COc1cccc(NC(=O)C2C3C=CC4(O3)C2C(=O)N(C(C)C)C4C(=O)NC2CCCCC2C)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?