4,4-dihydroxy-all-trans-beta-carotene <=> echinenone + H2O
4,4-dihydroxy-all-trans-beta-carotene <=> echinenone + h2o
4,4-dihydroxy-all-trans-beta-carotene <=> echinenone + H2O
4,4-dihydroxy-all-trans-beta-carotene <=> echinenone + h2o