C[C@H](NC1=CC(=O)C(N[C@@H](C)[C@H](O)c2ccccc2)=CC1=O)[C@H](O)c1ccccc1
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?