O=C(O)CCCC(=O)N1N=C(c2c(O)nc3ccc(Cl)cc3c2-c2ccccc2)CC1c1cccs1
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?