COc1ccc2c(c1)O[C@H](c1ccc3c(c1)OCO3)[C@@H](OC(=O)NCc1ccco1)C2=O
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?