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