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Effect of molecular weight and presence of heteroatoms.
| MW < 300 | MW ≥ 300 | Only C and O | N present | S present | Halogen present | |
|---|---|---|---|---|---|---|
| Number of cases | 668 | 332 | 184 | 769 | 199 | 318 |
| Exact structure (%) | 8.5 | 3.9 | 9.8 | 6.1 | 5.5 | 5.7 |
| Exact formula (%) | 45.4 | 27.1 | 63.6 | 34.1 | 23.6 | 25.8 |
