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