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| Retention time (min) | Observed m/z value ([M + H]+) | Calculated m/z value ([M + H]+) | Error (ppm) | Formula | |
|---|---|---|---|---|---|
| Asterina-330 | 3.0 | 289.1395 | 289.1400 | −0.7 | C12H19N2O6 |
| Shinorine | 1.7 | 333.1297 | 333.1298 | −0.3 | C13H21N2O8 |
| Porphyra-334 | 2.2 | 347.1454 | 347.1454 | 0 | C14H22N2O8 |
