COc1cc([C@@H]2c3cc4c(cc3[C@H](OC3OC5COC(C(C)C)OC5C(O)C3O)C3COC(=O)[C@@H]32)OCO4)cc(OC)c1O
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?