COc1ccc(Cn2c(=O)n(-c3ccc(OC)cc3)c(=O)c3c2c2cc(OC)ccc2n3C)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?