Cc1c(CCOC(=O)C23CC4(C)CC(C)(CC(C)(C4)C2)C3)sc[n+]1CC(=O)c1ccccc1.[Br-]
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?