CCOC(=O)CCCCC(=O)c1[nH]c(O)nc1C[n+]1ccc(C)cc1.[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?