CCCC1(C(=O)OCC)NC(c2ccc(OC)cc2OC)C2C(=O)N(c3ccccc3)C(=O)C21
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?