COc1cc2c[n+](C)c3c4cc(OC)c(OCc5ccccc5)cc4c(OCc4ccccc4)cc3c2cc1OC.CS(=O)(=O)[O-]
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?