Compound as reactive (2)

all-trans-3,4-didehydrolycopene → apo-4'-lycopenal

all-trans-3,4-didehydrolycopene → torulene

Compound as product (2)

5 an oxidized electron donor + 15-cis-phytoene → 5 a reduced electron donor + all-trans-3,4-didehydrolycopene

an oxidized electron donor + all-trans-lycopene → all-trans-3,4-didehydrolycopene + a reduced electron donor

Reversible reaction (1)

FAD + all-trans-lycopene + H⁺ ↔ FADH₂ + all-trans-3,4-didehydrolycopene