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