preferred_name: a carotenoid beta-end derivative + 2 A <=> a carotenoid phi-end derivative + 2 AH2
preferred_name_lc: a carotenoid beta-end derivative + 2 a <=> a carotenoid phi-end derivative + 2 ah2
label: a carotenoid beta-end derivative + 2 A <=> a carotenoid phi-end derivative + 2 AH2
label_lc: a carotenoid beta-end derivative + 2 a <=> a carotenoid phi-end derivative + 2 ah2