COc1ccc2nc3cc(Cl)ccc3c(NCCNC(=O)Cn3c(=O)n(C)c(=O)c4c3nc3c(c(=O)n(C)c(=O)n3C)[n+]4[O-])c2c1
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?