O=C1/C(=C/c2ccc(Cl)cc2)N=C(c2ccccc2)N1C1Nc2cc3c(cc2S1)NC(N1C(=O)/C(=C/c2ccc(Cl)cc2)N=C1c1ccccc1)S3
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?