CCc1c(OC(C)=O)c2c(NC3OC(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C3OC(C)=O)nc(OC)nc2oc1=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?