COc1ccc(-c2cc(=O)oc3c(C)c(OC(C)C(=O)N4C[C@@H]5C[C@H](C4)Cn4c5cccc4=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?