COC1OC(COS(=O)(=O)c2ccc(C)cc2)C(O)C(OS(=O)(=O)c2ccc(C)cc2)C1OS(=O)(=O)c1ccc(C)cc1
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?