CCCC(=O)c1c(NOC2OC(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C2OC(C)=O)nc(OC)n(C)c1=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?