COc1cc2c(cc1OC)C(=O)C1(C2)[C@H](c2ccccc2)C2C(=O)c3cc(OC)c(OC)cc3C2[C@H]1c1ccccc1
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?