Spirodiketopiperazines of mannofuranose: carbopeptoid alpha-amino acid esters at the anomeric position of mannofuranose - Estevez, J; Burton, J; Estevez, R; Ardron, H; Wormald, MR; Dwek, R; Brown, D; Fleet, G (TETRAHEDRON-ASYMMETRY, 1998)