COc1ccc(NC(=O)c2ccc(NC3CC(=O)N(c4ccc(C)cc4C)C3=O)cc2)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?