COc1ccc2oc(C(=O)OCC(=O)Nc3ccc(OC)c(S(N)(=O)=O)c3)c(C)c2c1
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?