CC(=O)Oc1ccc2c(c1)oc1c3ccc(OC(C)=O)cc3n(C)c(=O)c21
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?