urate(in) + (S)-lactate(out) => urate(out) + (S)-lactate(in)
urate(in) + (s)-lactate(out) => urate(out) + (s)-lactate(in)
urate(in) + (S)-lactate(out) => urate(out) + (S)-lactate(in)
urate(in) + (s)-lactate(out) => urate(out) + (s)-lactate(in)