preferred_name: canthaxanthin + 2 A + 3 H2O => echinenone + 2 AH2 + 2 O2
preferred_name_lc: canthaxanthin + 2 a + 3 h2o => echinenone + 2 ah2 + 2 o2
label: canthaxanthin + 2 A + 3 H2O => echinenone + 2 AH2 + 2 O2
label_lc: canthaxanthin + 2 a + 3 h2o => echinenone + 2 ah2 + 2 o2