CC1(C)OCC2OC3([C@@H]4OC(C)(C)O[C@H]4CO)OC(C)(C)OC3C2O1
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?