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Experimental and calculated 1H NMR data for the compound 1 in different solvents. The chemical shifts values are given in ppm and the 3JHH coupling constants in Hz.
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| solvent | ε | δHa | δHb1 | δΗb2 | 3JHaHb1,obs | 3JHaHb1,calc | 3JHaHb2,obs | 3JHaHb2,calc |
| CDCl3 | 4.8 | 4.00 | 2.24 | 2.17 | 5.1 ± 0.05 | 4.6 | 7.1 ± 0.05 | 7.5 |
| CD2Cl2 | 9.1 | 3.97 | 2.22 | 2.14 | 5.2 ± 0.05 | 4.8 | 7.0 ± 0.05 | 7.3 |
| CD3CN | 37.5 | 3.84 | 2.09 | 2.09 | 6.1 ± 0.05 | 4.7 | 6.1 ± 0.05 | 7.4 |
| DMSO-d6 | 46.7 | 3.55 | 1.89 | 1.78 | 5.6 ± 0.05 | 4.7 | 7.4 ± 0.05 | 7.4 |
