COC(=O)[C@@H]1C2CC3c4[nH]c5cc(OC)ccc5c4CCN3CC2C[C@H](OC(=O)c2cc(OC)c(OC)c(OC)c2)C1OC
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?