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