2641-81-8 6-phospho-D-glucono-1,5-lactone 6-phosphogluconolactone D-6-P-GLUCONO-DELTA-LACTONE D-6-phospho-glucono-delta-lactone D-6-phosphoglucono-delta-lactone D-glucono-1,5-lactone-6-phosphate D-glucono-delta-lactone-6-phosphate