preferred_name: 15-cis-phytoene + 2 A => all-trans-zeta-carotene + 2 AH2
preferred_name_lc: 15-cis-phytoene + 2 a => all-trans-zeta-carotene + 2 ah2
label: 15-cis-phytoene + 2 A => all-trans-zeta-carotene + 2 AH2
label_lc: 15-cis-phytoene + 2 a => all-trans-zeta-carotene + 2 ah2