Table 2.

All possible combinations of groups used for various gHBfix settings and their abbreviations. See Table 1 for atoms involved within each group.

gHBfix name	Donors	Acceptors
2-OH…nbO	2’-OH (sugar)	nbO (phosphate)
2-OH…bO	2’-OH (sugar)	bO (phosphate)
2-OH…O2	2’-OH (sugar)	O2’ (sugar)
2-OH…O4	2’-OH (sugar)	O4’ (sugar)
2-OH…N	2’-OH (sugar)	N (base)
2-OH…O	2’-OH (sugar)	O (base)
NH…N	NH (base)	N (base)
NH…O	NH (base)	O (base)
NH…O2	NH (base)	O2’ (sugar)
NH…O4a	NH (base)	O4’ (sugar)
NH…bOa	NH (base)	bO (phosphate)
NH…nbOa	NH (base)	nbO (phosphate)

^aNot tested in this work.