preferred_name: 2 all-trans-retinal => all-trans-beta-carotene + O2
preferred_name_lc: 2 all-trans-retinal => all-trans-beta-carotene + o2
label: 2 all-trans-retinal => all-trans-beta-carotene + O2
label_lc: 2 all-trans-retinal => all-trans-beta-carotene + o2