preferred_name: nicotinate(in) + urate(out) => nicotinate(out) + urate(in)
preferred_name_lc: nicotinate(in) + urate(out) => nicotinate(out) + urate(in)
label: nicotinate(in) + urate(out) => nicotinate(out) + urate(in)
label_lc: nicotinate(in) + urate(out) => nicotinate(out) + urate(in)