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1H and 13C NMR chemical shifts of phenazine-1-carboxylic acid and HMBC data in CDCL3, δ, ppm at 400 MHz.
| Atom position | δ H (J in Hz) | δ C | HMBC (H→C) |
| 1 | 125.06 | ||
| 2 | 8.53, dd (8.7, 1.1) | 135.25 | 4, 1a |
| 3 | 8.05, m | 130.42 | 1, 4a |
| 4 | 8.98, dd (7.1, 1.1) | 137.57 | 2, 1a, COOH |
| 1a | − | 140.19 | |
| 4a | − | 143.51 | |
| 5a | − | 144.22 | |
| 8a | − | 139.97 | |
| 5 | 8.35, dd (8.1, 1.8) | 130.21 | 7, 8a |
| 6 | 7.97, dd (6.6, 1.3) | 131.88 | 5a, 8 |
| 7 | 8.01, m | 133.36 | 5, 8a |
| 8 | 8.29, dd (8.0, 1.8) | 128.11 | 5a, 6 |
| COOH | 166.07 |
