COc1cc(C(=O)O[C@@H]2[C@@H](OC(=O)c3cc(OC)c(OC)c(OC)c3)[C@@H](OC)O[C@@H]3CO[C@@H](c4ccccc4)O[C@@H]23)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?