C=CCN(c1cc(OCc2ccccc2)c(NC(C)=O)cc1[N+](=O)[O-])S(C)(=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?