preferred_name: tetracycline(in) + H(+)(out) = tetracycline(out) + H(+)(in)
preferred_name_lc: tetracycline(in) + h(+)(out) = tetracycline(out) + h(+)(in)
label: tetracycline(in) + H(+)(out) = tetracycline(out) + H(+)(in)
label_lc: tetracycline(in) + h(+)(out) = tetracycline(out) + h(+)(in)