COC(=O)C1=C(c2ccc3c(c2)OCO3)O[C@H](c2cc(OC)c(OC)c(OC)c2)[C@H]1COC(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?