COc1ccc2cc(CN3CCC(C4CCN(Cc5ccc6cc(OC)ccc6c5)CC4)CC3)ccc2c1.Cl
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?