Table 1. Overview of frequently used definitions of glycosidic torsion angles.

Angle	NMR style	C − 1 crystallographic style	C + 1 crystallographic style
ϕ	H1—C1—O—C′x	O5—C1—O—C′x	O5—C1—O—C′x
ψ	C1—O—C′x—H′x	C1—O—C′x—C′x−1	C1—O—C′x—C′x+1
ψ [(1–6)-linkage]	C1—O—C′6—C′5	C1—O—C′6—C′5	C1—O—C′6—C′5
ω	O—C′6—C′5—H′5	O—C′6—C′5—C′4	O—C′6—C′5—O′5