COC(=O)C1=CSC2(S1)C(C(=O)OC)=CSc1c2ss/c1=N\c1ccccc1
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?