There are two nontrivial independent Wegscheider's identities for this system: k 1 + k 2 + k 3 + = k 1 − − k 2 − − k 3 − − and k 3 + k 4 + / k 2 + = k 3 − − k 4 − − / k 2 − − They correspond to the following linear relations between the stoichiometric vectors: γ γ 1 + γ γ 2 + γ γ 3 = 0 and γ γ 3 + γ γ 4 − − γ γ 2 = 0.