Table 2. GCO Analysis Results of Amide II Modes of Conformers α₃^* and β₂^a.

conf.	NM	freq.	D01	R01	R01GCO	R01IF	R01R
β2	53	1445.6	416.7	–142.4	–145.8	+16.1	–12.6
β2	55	1454.2	279.6	+230.9	+185.4	+49.1	–3.6
α3*	54	1449.3	4.3	+3.7	+0.2	+4.0	–0.5
α3*	59	1565.6	387.8	–24.5	+2.8	–21.5	–5.8

^aGCO fragments are defined in Figure 7. Frequencies are given in cm^–1, dipole strength D₀₁ in 10^–40 esu²·cm², and rotational strength R₀₁ and its contributions R₀₁^GCO, R₀₁, and R₀₁^R in 10^–44 esu²·cm².