CCCCCN1C(C(=O)c2ccccc2)=C(OC(=O)CC)c2ccccc2S1(=O)=O
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?