COc1ccc2[nH]c3c(C)c4cc[n+](COC(=O)c5ccccc5)cc4c(C)c3c2c1.[I-]
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?