O=C(O)[C@H]1CCCC[C@@H]1c1c2ccc(=O)c(O)c-2oc2c(O)c(O)ccc12
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?