# 6,8-Dihy-droxy-8a-methyl-3,5-dimethyl-idenedeca-hydro-naphtho-[2,3-b]furan-2(3H)-one.
> 中国薬用植物由来のユーデスマノライド系化合物の結晶構造解析


## Abstract

This study reports the crystal structure of C15H20O4, a eudesmanolide-type sesquiterpene lactone obtained from the Chinese medicinal plant Carpesium triste Maxim. The molecular framework consists of three rings: two fused six-membered rings adopting chair conformations and one five-membered ring in a flattened envelope conformation. Within the crystal lattice, two hydroxyl groups participate in both intramolecular and intermolecular O-H···O hydrogen bonding. The hydrogen atoms associated with these groups exhibit positional disorder, with site-occupation factors of 0.5. Intermolecular hydrogen bonds organize the molecules into chains extending along the [010] direction.

## Bibliographic

- **Authors**: Liu TT, Wu HB, Wang WS
- **Journal**: Acta Crystallogr Sect E Struct Rep Online
- **Year**: 2012 (2012-11-01)
- **PMID**: [23284548](https://pubmed.ncbi.nlm.nih.gov/23284548/)
- **DOI**: [10.1107/S160053681204425X](https://doi.org/10.1107/S160053681204425X)
- **PMC**: [PMC3515328](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3515328/)
- **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 23284548. https://h2-papers.org/en/papers/23284548
> **Source**: PubMed PMID [23284548](https://pubmed.ncbi.nlm.nih.gov/23284548/)