O=C(CCCN1C(=O)/C(=C/c2ccco2)SC1=S)Nc1cccc(C(=O)O)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?