2 distinct modifications were found.
Omit Na-L-lactate and add 3.4 g/l Na-formate, 0.16 g/l Na-acetate and 5.0 g/l Na2S2O3 from sterile anoxic stock solutions prepared under 100% N2 gas.
Replace Na-L-lactate with 1.0 g/l Na2-DL-malate.