D-xylotetraonate + H(+) => D-xylotetraono-1,5-lactone + H2O
d-xylotetraonate + h(+) => d-xylotetraono-1,5-lactone + h2o
D-xylotetraonate + H(+) => D-xylotetraono-1,5-lactone + H2O
d-xylotetraonate + h(+) => d-xylotetraono-1,5-lactone + h2o