Piperidine analogues of D-galactose as potent inhibitors of alpha-galactosidase: Synthesis by stannane-mediated hydroxymethylation of 5-azido-1,4-lactones. Structural relationships between D-galactosidase and L-rhamnosidase inhibitors - Shilvock, J; Nash, R; Watson, A; Winters, A; Butters, T; Dwek, R; Winkler, D; Fleet, G (JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1999)