CCCCn1c(N)c(-c2nc3ccccc3o2)c2c([N+](=O)[O-])nn(C)c(=O)c21
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?