CC1(C)OC(C(O)(c2cccc3c2oc2ccccc23)c2cccc3c2oc2ccccc23)C(C(O)(c2cccc3c2oc2ccccc23)c2cccc3c2oc2ccccc23)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?