Oc1c(C(c2ccccc2)N2CCN(c3cccc(Cl)c3)CC2)sc2nc(-c3ccco3)nn12
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?