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