% '2-keto-L-gulono-1,4-lactone'


config('2-keto-L-gulono-1,4-lactone',[
        ring([
                keto(1),
                keto(2),
                car(3,hyd&&hydroxyl),
                car(4,(car(5,hyd&&hydroxyl&&hydroxymethyl)~)&&hyd),
                oxy])]).