CSC[C@H](NC(=O)Cc1c(C)c2cc3c(C)c(C)oc3cc2oc1=O)C(=O)N[C@@H](Cc1ccccc1)C(=O)O
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?