COc1ccc2cc(-c3cc(C(=O)OCC(=O)Nc4c(C)n(C)n(-c5ccccc5)c4=O)c4ccccc4n3)ccc2c1
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?