Cc1ccccc1-n1c(=O)[nH]c(O)c(C(c2ccncc2)c2c(O)[nH]c(=O)n(-c3ccccc3C)c2=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?