CC(=O)Oc1c2c(c(OC(C)=O)c3c1n(C(C)=O)c1ccccc1n3C(C)=O)n(C(C)=O)c1ccccc1n2C(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?