CO/N=C(/C(=O)N[C@H]1C(=O)N2C(C(=O)[O-])=C(COC(C)=O)CSC12)c1csc(N)n1.[Na+]
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?