145932-53-2 3KB-G5 4,6-O-3-Ketobutylidene maltopentaose D-Glucose, O-4,6-O-(3-oxobutylidene)-alpha-D-glucopyranosyl-(1-4)-O-alpha-D-glucopyranosyl-(1-4)-O-alpha-D-glucopyranosyl-(1-4)-O-alpha-D-glucopyranosyl-(1-4)-