COc1ccc(C(=O)c2cn(Cc3cccc(C)c3)c3cc4c(cc3c2=O)OCCO4)cc1OC
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?