Table 2.

Conformational parameters for compounds 1–4

Compound	Conformational data
	Ktrans/cisa	Ring puckerb	d (Å)b	θ (o)b	Δ (Å)b	Θ (°)b
1	2.8	endo	ND	ND	ND	ND
2	4.0	exo	3.01	91.9	0.025	2.88
3	1.6	endo	ND	ND	−0.054	−6.28
4	2.8	exo	2.99	94.8	0.018	2.14

^aIn D₂O at 25 °C; values are ±10%.

^bFrom X-ray diffraction analysis of the crystalline compound. d is the O_i−1···C′_i distance; θ is the O_i−1···C′_i =O′_i angle; Δ is the C′_i···plane(C^α_i O_i′ O_i+1) distance; and Θ is the O′_i···plane(C^α_i C_i′ O_i+1) angle (Choudhary et al. 2009). ND, not determined.