Cc1c(C(=O)O)sc2nc(SCC(=O)Nc3ccc(S(=O)(=O)NCCCC(=O)O)cc3)nc(O)c12
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?