CCCOc1ccccc1N=C(NC(=O)COc1ccc(OC)cc1)Nc1nc(C)cc(C)n1
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?