COc1cccc(CNC(=O)COc2cc3c(c4oc(=O)cc(C)c24)CCC(C)(C)O3)c1
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?