malonate(out) + (S)-malate(in) <=> malonate(in) + (S)-malate(out)
malonate(out) + (s)-malate(in) <=> malonate(in) + (s)-malate(out)
malonate(out) + (S)-malate(in) <=> malonate(in) + (S)-malate(out)
malonate(out) + (s)-malate(in) <=> malonate(in) + (s)-malate(out)