Looking for a source of D-mannoheptulose. Sigma, Fluka, ICN, Pfanstiehl, Boehringer Mannheim, & others no longer carry this product. Any help appreciated. Relpy to: R. Brooks Robey, M.D., Medicine/Nephrology (M/C 793), UIC College of Medicine, 820 South Wood St., 418W CSN, Chicago, IL 60612-7315, FAX 312/455-5877, e-mail RBRobey at uic.edu