COc1cc2c(c(O)c1OC)-c1c(cc(OC)c(OC)c1O)[C@@H](OC(=O)c1ccccc1)[C@@](C)(O)[C@@H](C)[C@@H]2OC(C)=O
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?