D-maltohexaose + alpha-D-glucose => D-maltoheptaose + H2O
d-maltohexaose + alpha-d-glucose => d-maltoheptaose + h2o
D-maltohexaose + alpha-D-glucose => D-maltoheptaose + H2O
d-maltohexaose + alpha-d-glucose => d-maltoheptaose + h2o