CCNc1nc(NCC)n2c(SC(C(=O)Nc3cc(Cl)cc(Cl)c3)c3ccccc3)nnc2n1
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?