COc1cc([C@H]2c3cc4c(cc3[C@@H](O[C@H]3O[C@H]5CO[C@@H](C)O[C@H]5[C@@H](O)[C@@H]3O)[C@@H]3COC(=O)[C@H]23)OCO4)cc(OC)c1O
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?