COc1cc2c(cc1OC)-c1c(cnn1C1OC(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C1OC(C)=O)CC2
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?