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 <=> alpha-isomaltosyl-(1->4)-d-maltotriose + d-maltotriose