1,1'-dihydroxy-1,1',2,2'-tetrahydroneurosporene + A <=> 1'-hydroxy-demethylspheroidene + AH2
1,1'-dihydroxy-1,1',2,2'-tetrahydroneurosporene + a <=> 1'-hydroxy-demethylspheroidene + ah2
1,1'-dihydroxy-1,1',2,2'-tetrahydroneurosporene + A <=> 1'-hydroxy-demethylspheroidene + AH2
1,1'-dihydroxy-1,1',2,2'-tetrahydroneurosporene + a <=> 1'-hydroxy-demethylspheroidene + ah2