CCOC(=O)c1c(NC(=O)c2c(C(=O)O)cccc2[N+](=O)[O-])sc2c1CCCC2
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?