Cc1ccc(N2C(=O)C3C=CC(n4[nH]c(=O)n(Cc5ccccc5)c4=O)CC3C2=O)cc1
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?