reduced riboflavin + NAD(+) <=> riboflavin + NADH + 2 H(+)
reduced riboflavin + nad(+) <=> riboflavin + nadh + 2 h(+)
reduced riboflavin + NAD(+) <=> riboflavin + NADH + 2 H(+)
reduced riboflavin + nad(+) <=> riboflavin + nadh + 2 h(+)