O=C1CCC(C(=O)N(Cc2cccs2)C2(C(=O)NC3CCCCC3)CCCCC2)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?