CCS(=O)(=O)c1ncc(N(Cc2ccccc2)Cc2ccco2)c(C(=O)Nc2cccc(Cl)c2C)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?