Fig. 6. The UV-vis-NIR absorption spectra of 3 (a) and 4 (b), syn-/anti-5ah (c), and 5ea and 6 (d) in CH2Cl2 solution (4.0 × 10–5 M for 3 and 4; 1.0 × 10–5 M for 5ah, 5ea and 6) ε = extinction coefficient.
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