# (4R,5R,6S,7R,8S,9R,10S,13S)-7,8β-Epoxy-momilactone-A.
> パキスタン産野生ハーブ由来ジテルペン化合物のエポキシ誘導体の結晶構造解析


## Abstract

A pimarane-diterpene compound with the molecular formula C20H26O4 was isolated from Leucas urticifolia, a wild herb of the Lamiaceae family found across Punjab, Baluchistan, Sindh, and the Rajputana desert regions of Pakistan. The compound features a pentacyclic framework arising from the fusion of an epoxy ring onto the momilactone-A skeleton. Its absolute configuration was tentatively assigned by comparison with the known crystal structure of momilactone, though further confirmation is required. Solid-state packing is stabilized by four intermolecular C-H···O hydrogen-bonding interactions.

## Bibliographic

- **Authors**: Shabnam Habib R, Jamshaid M, Tahir MN, Khan TJ, Khan IU
- **Journal**: Acta Crystallogr Sect E Struct Rep Online
- **Year**: 2008 (2008-04-23)
- **PMID**: [21202375](https://pubmed.ncbi.nlm.nih.gov/21202375/)
- **DOI**: [10.1107/S1600536808010556](https://doi.org/10.1107/S1600536808010556)
- **PMC**: [PMC2961202](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2961202/)
- **Study type**: other
- **Delivery route**: not specified
- **Effect reported**: not assessed

## Delivery context

The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).

## Safety notes

The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).

See also:
- [Inhalation concentration and LFL / UFL](https://h2-papers.org/en/safety-notes/inhalation-concentration)
- [Consumer Affairs Agency accident cases](https://h2-papers.org/en/safety-notes/accident-cases)

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> **Cite as**: H2 Papers — PMID 21202375. https://h2-papers.org/en/papers/21202375
> **Source**: PubMed PMID [21202375](https://pubmed.ncbi.nlm.nih.gov/21202375/)