Cc1cc(CNC(=O)COC(=O)Cn2[nH]c(=O)c3ccccc3c2=O)cc(C)c1O
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?