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 => 1,1'-dihydroxy-1,1',2,2'-tetrahydroneurosporene + a