CCOC(=O)C1=C(C)C2C3C(=O)N(c4ccc(C)cc4C)C(=O)C3C1(C)C1C(=O)N(c3ccc(C)cc3C)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?