Table 1.

Definitions of frames of reference for the saccharides and the aromatic analogs

Aromatic residue/saccharide	Aromatic residue analog	Total no. of atoms	Atom at the origin	Atom along the X-axis	Atom in the XY-plane
Tryptophan	3-Methylindole (3MeIn)	19	Cδ2	Cɛ2	Cζ2
Phenylalanine	Toluene (Tol)	15	Cɛ1	Cɛ2	Cδ2
Tyrosine	pHydroxytoluene (pOHTol)	16	Cɛ1	Cɛ2	Cδ2
β-D-Galactose	—	24	C4	C5	O5
β-D-Glucose	—	24	C4	C5	O5