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