Cc1cccc2c(N)c3cccc(C(=O)NCC[N+](C)(C)Cc4ccc(S(C)(=O)=O)cc4)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?