preferred_name: 9,9',15-tri-cis-zeta-carotene <=> 9,9'-di-cis-zeta-carotene
preferred_name_lc: 9,9',15-tri-cis-zeta-carotene <=> 9,9'-di-cis-zeta-carotene
label: 9,9',15-tri-cis-zeta-carotene <=> 9,9'-di-cis-zeta-carotene
label_lc: 9,9',15-tri-cis-zeta-carotene <=> 9,9'-di-cis-zeta-carotene