CN(CCc1ccccc1)C(=O)c1cccc(NC(=O)Cc2cccc(NC(=O)C3CCN(C(=O)c4ccccc4)CC3)c2)c1
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?