c1ccc(-c2ccc(C3=Nn4c(nnc4-c4cc(-c5ccccc5)[nH]n4)SC3)cc2)cc1
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?