(R)-lactate(out) + (S)-malate(in) => (R)-lactate(in) + (S)-malate(out)
(r)-lactate(out) + (s)-malate(in) => (r)-lactate(in) + (s)-malate(out)
(R)-lactate(out) + (S)-malate(in) => (R)-lactate(in) + (S)-malate(out)
(r)-lactate(out) + (s)-malate(in) => (r)-lactate(in) + (s)-malate(out)