urate(out) + succinate(in) <=> urate(in) + succinate(out)
urate(out) + succinate(in) <=> urate(in) + succinate(out)
urate(out) + succinate(in) <=> urate(in) + succinate(out)
urate(out) + succinate(in) <=> urate(in) + succinate(out)