COc1cc2c(cc1NC(=O)COC(=O)[C@@H](NS(=O)(=O)c1ccccc1)C(C)C)oc1ccccc12
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?