CCOC(=O)C1CCCN(C(=O)c2cccc(S(=O)(=O)N(C)c3c(C)n(C)n(-c4ccccc4)c3=O)c2)C1
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?