β-p- (top left), β-f- (top right), α-p- (bottom left), α-f- (bottom right), and keto-D-Fructose (center) - all PIMM91 structures.

Fructose Tautomers
sld	mlp1	mlp2	mlp3	mlp4
β-D-Fructopyranose
mep1	mlp1	mlp2	mlp3	mlp4
β-D-Sorbopyranose
		mlp

Image Notes
mlp1,2	Molecular lipophilicity patterns (MLP, yellow-brown: hydrophobic, blue: hydrophilic areas) - Absolute (over-all) scaling
mlp3,4	Individual (private) scaling

For details see:

Molecular Modeling of Saccharides, Part III. Sucrose, Sucralose, and Fructose: Correlations Between Hydrophobicity Potential Profiles and AH-B-X Assignments. F. W. Lichtenthaler and S. Immel, in: Sweet Taste Chemoreception (Eds.: M. Mathlouthi, J. A. Kanters, and G. G. Birch), Elsevier Appl. Science, London/New York, 1993, pp. 21-53.
Abstract