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