Cc1cccc2c(N)c3cccc(C(=O)NCC[N+](C)(C)Cc4ccccc4[N+](=O)[O-])c3nc12.[Cl-]
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?