O=C(NCCN1C(=O)S/C(=C\c2ccc(Cl)c(Cl)c2)C1=O)c1ccc2c(c1)C(=O)N(Cc1ccncc1)C2=O
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?