CC1(C)OCC(C2OC(On3nnc4ccc(Cl)cc43)C3OC(C)(C)OC23)O1
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?