COc1ccc(C2CC(=O)C(C(c3ccc(O)cc3)C3C(=O)CC(c4ccc(OC)cc4)CC3=O)C(=O)C2)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?