Trigocherrin A The First Natural Chlorinated Daphnane Diterpene Orthoester From Trigonostemon Cherrieri

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Trigocherrin A, the First NaturalChlorinated Daphnane Diterpene Orthoester from Trigonostemon cherrieri

Terms

• Daphnane diterpenoid orthoester (DDO): A diterpene natural product class with a complex oxygenated polycyclic structure and orthoester group.
• Organohalogen: Organic molecule containing halogen atoms, such as chlorine.
• HRESIMS: High-resolution electrospray ionization mass spectrometry.
• Isotope pattern: MS peak pattern caused by natural isotope abundances.
• NMR: Nuclear magnetic resonance spectroscopy. Used to determine molecular structure and atom connectivity.

Notes

HRESIMS gave the molecular formula: C38H36Cl2O12 Observed [M+H]+ and [M+H+2]+ peaks with a ratio consistent with chlorine atoms.

isotope pattern helps identify halogens, not just molecular mass.

For atom identification work, this is useful because chlorine is detectable from isotope signatures due to natural isotope abundance.

Findings:

1. chlorine atoms can be inferred from isotope pattern
2. fluorine lacks the same isotope pattern advantage
3. molecular formula prediction should account for halogens differently
4. mass spec alone may identify formula but not complete structure
5. structural class/source metadata can act as useful priors
6. natural product papers contain rich graph relations
7. artifact checks are important for halogenated molecules