preferred_name: a carotenoid psi-end group = a carotenoid epsilon-end group
preferred_name_lc: a carotenoid psi-end group = a carotenoid epsilon-end group
label: a carotenoid psi-end group = a carotenoid epsilon-end group
label_lc: a carotenoid psi-end group = a carotenoid epsilon-end group