O=C(Cn1cnc2c(cnn2-c2ccccc2)c1=O)Nc1cc(S(=O)(=O)N2CCOCC2)ccc1Cl
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?