O=C(NC[C@@H]1CCCO1)c1cccc2c1C(=O)c1ccc(N3CCOCC3)cc1S2(=O)=O
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?