(R)-lactaldehyde + NAD(+) <=> methylglyoxal + NADH + H(+)
(r)-lactaldehyde + nad(+) <=> methylglyoxal + nadh + h(+)
(R)-lactaldehyde + NAD(+) <=> methylglyoxal + NADH + H(+)
(r)-lactaldehyde + nad(+) <=> methylglyoxal + nadh + h(+)