preferred_name: norspermidine + CO2 => carboxynorspermidine + H(+)
preferred_name_lc: norspermidine + co2 => carboxynorspermidine + h(+)
label: norspermidine + CO2 => carboxynorspermidine + H(+)
label_lc: norspermidine + co2 => carboxynorspermidine + h(+)