C=CC(C)(C)n1cc(C2=C(O)C(=O)C(c3cn(C(C)(C)C=C)c4ccccc34)=C(O)C2=O)c2ccccc21
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?