CCCN1C[C@H](CSC)C[C@H]2c3cccc4[nH]cc(c34)C[C@@H]21.CS(=O)(=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?