alpha-maltotriose + alpha-D-glucose 1-phosphate => alpha-maltotetraose + phosphate
alpha-maltotriose + alpha-d-glucose 1-phosphate => alpha-maltotetraose + phosphate
alpha-maltotriose + alpha-D-glucose 1-phosphate => alpha-maltotetraose + phosphate
alpha-maltotriose + alpha-d-glucose 1-phosphate => alpha-maltotetraose + phosphate