COc1cc2nc3n(c(=O)c2cc1OC)-c1cc2ccccc2cc1C(=O)NC3CC(C)C
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?