Symbols within the SNFG nomenclature refer to either the D or L form of the monosaccharide based upon what is most common in nature. The 3D-SNFG code does NOT differentiate between L and D residues. For example, the red triangle within the SNFG refers to an L-Fucose; however, both L and D Fucose are represented by red cones within the 3D-SNFG script.