Cc1cc(C)nc(SCc2nnc(SCC(=O)Nc3ncc(C)s3)n2Cc2ccco2)n1
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?