COc1cc(C(CCN2CCCCC2)c2c(OC)cc(OC)c3c2OC(=O)CC3c2ccc(N(C)C)cc2)cc(OC)c1OC
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?