preferred_name: chemical entity + acetaldehyde + nitrite + H(+) => ethylnitronate + O2
preferred_name_lc: chemical entity + acetaldehyde + nitrite + h(+) => ethylnitronate + o2
label: chemical entity + acetaldehyde + nitrite + H(+) => ethylnitronate + O2
label_lc: chemical entity + acetaldehyde + nitrite + h(+) => ethylnitronate + o2