CC1C(=O)C(C)C2N(C(=O)C3C(C(=O)O)C4C=CC32O4)C1c1ccco1
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?