2 alpha-D-glucose 1-phosphate + H2O <=> D-maltose + 2 phosphate
2 alpha-d-glucose 1-phosphate + h2o <=> d-maltose + 2 phosphate
2 alpha-D-glucose 1-phosphate + H2O <=> D-maltose + 2 phosphate
2 alpha-d-glucose 1-phosphate + h2o <=> d-maltose + 2 phosphate