COc1cc([C@@H]2c3cc4c(cc3[C@H](OC3OC5COC(c6ccco6)OC5C(O)C3O)C3COC(=O)[C@@H]32)OCO4)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?