preferred_name: acetylcholine(in) + 2 H(+)(out) => acetylcholine(out) + 2 H(+)(in)
preferred_name_lc: acetylcholine(in) + 2 h(+)(out) => acetylcholine(out) + 2 h(+)(in)
label: acetylcholine(in) + 2 H(+)(out) => acetylcholine(out) + 2 H(+)(in)
label_lc: acetylcholine(in) + 2 h(+)(out) => acetylcholine(out) + 2 h(+)(in)