alpha-maltose 1-phosphate + [(1->4)-alpha-D-glucosyl](n) = [(1->4)-alpha-D-glucosyl](n+2) + phosphate
alpha-maltose 1-phosphate + [(1->4)-alpha-d-glucosyl](n) = [(1->4)-alpha-d-glucosyl](n+2) + phosphate
"alpha1,4-glucan:maltose-1-P maltosyltransferase"
"alpha1,4-glucan:maltose-1-p maltosyltransferase"