preferred_name: Li(+)(in) + 2 H(+)(out) <=> Li(+)(out) + 2 H(+)(in)
preferred_name_lc: li(+)(in) + 2 h(+)(out) <=> li(+)(out) + 2 h(+)(in)
label: Li(+)(in) + 2 H(+)(out) <=> Li(+)(out) + 2 H(+)(in)
label_lc: li(+)(in) + 2 h(+)(out) <=> li(+)(out) + 2 h(+)(in)