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