COc1ccc(-c2cc(=O)oc3c(C)c(OCC(=O)N[C@@H](Cc4ccc(O)cc4)C(=O)O)ccc23)cc1
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?