preferred_name: thymine(out) + Na(+)(out) = thymine(in) + Na(+)(in)
preferred_name_lc: thymine(out) + na(+)(out) = thymine(in) + na(+)(in)
label: thymine(out) + Na(+)(out) = thymine(in) + Na(+)(in)
label_lc: thymine(out) + na(+)(out) = thymine(in) + na(+)(in)