alpha-isomaltosyl-(1->4)-D-maltotriose + D-maltotriose => 2 D-maltotetraose
alpha-isomaltosyl-(1->4)-d-maltotriose + d-maltotriose => 2 d-maltotetraose
alpha-isomaltosyl-(1->4)-D-maltotriose + D-maltotriose => 2 D-maltotetraose
alpha-isomaltosyl-(1->4)-d-maltotriose + d-maltotriose => 2 d-maltotetraose