CCn1c(=O)n(Cc2ccccc2C)c(=O)n([C@@H](Cc2ccccc2)C(=O)O)c1=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?