O=C1CCC(C(=O)OC(C(=O)c2c[nH]c3ccccc23)c2ccccc2)=NN1
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?