CS[C@]12C(=O)C[C@]3(C)[C@@H](CC[C@@]3(O)C(=O)CO)[C@@H]1CCC1=CC(=O)CC[C@]12C
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?