Table 1.

Selected backbone torsion angles and sugar pucker data for 8β and 11β and related bi/tricyclo-nucleosides from X-ray structures.

	γ	δ	χ	P	νmax
8β	86.8°	150.1°	−106.4°	167.8°	36.1
11β	86.9°	146.0°	−115.7°	160.7°	36.3
bc-Ta	149.3°	126.5°	−112.7°	128.4°	42.4
tc-Tb Mol A	125.0°	152.5°	−130.4°	172.2°	36.7
tc-Tb Mol B	154.8°	98.7°	−120.3°	94.4°	36.0

^aRef [33]; ^btwo structurally independent molecules per asymmetric unit.