label: 1,1'-dihydroxy-1,1',2,2'-tetrahydrolycopene + A = 1,1'-dihydroxy-3,4-didehydro-1,2-dihydrolycopene + AH2
label_lc: 1,1'-dihydroxy-1,1',2,2'-tetrahydrolycopene + a = 1,1'-dihydroxy-3,4-didehydro-1,2-dihydrolycopene + ah2