preferred_name: acetate(out) + H(+)(out) <=> acetate(in) + H(+)(in)
preferred_name_lc: acetate(out) + h(+)(out) <=> acetate(in) + h(+)(in)
label: acetate(out) + H(+)(out) <=> acetate(in) + H(+)(in)
label_lc: acetate(out) + h(+)(out) <=> acetate(in) + h(+)(in)