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