Cc1c(OCC(=O)N[C@@H](Cc2c[nH]c3ccccc23)C(=O)O)ccc2c1oc(=O)c1ccccc12
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?