CCCc1nn2c(O)c(C(c3cccc(Cl)c3)c3c(O)n4nc(CCC)sc4nc3=O)c(=O)nc2s1
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?