preferred_name: a long-chain alkane + CO2 => a long-chain fatty acid + hnu + H(+)
preferred_name_lc: a long-chain alkane + co2 => a long-chain fatty acid + hnu + h(+)
label: a long-chain alkane + CO2 => a long-chain fatty acid + hnu + H(+)
label_lc: a long-chain alkane + co2 => a long-chain fatty acid + hnu + h(+)