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Chemical shifts and percentages of species of DMSO-d6 solutions for compounds 1–4 after being oxidised for 24 hours.
| Compound | δ [ppm] (%) | δ [ppm] (%) | δ [ppm] (%) |
|---|---|---|---|
| 1 | −480.5 (7.1) | −541.4 (92.9) | |
| 2 | −481.9 (9.2) | −542.2 (90.8) | |
| 3 | −467.7 (41.7) | −541.0 (47.9) | −559.3(10.4) |
| 4 | −481.9 (6.9) | −541.2 (93.1) |
