en-yn-Dicycloether is a chamomile-associated spiroether best known as one of the characteristic volatile markers of German chamomile and related Asteraceae oils. The evidence base is strongest for identity, stereochemical occurrence, and analytical isolation, with smaller but still useful preclinical literature on fungal-toxin inhibition and insecticidal activity. For AromaForge, it is best described as a chemistry-forward chamomile marker constituent with limited direct human safety or clinical data.
Chemical identity and composition
The archive's generic `en_yn_dicycloether` entry maps most closely to the trans or (E)-spiroether used in German chamomile composition papers and supplier listings, while older and newer literature often treats the cis and trans isomers together. PubChem CID 5352494 and the NIST WebBook both support the (Z)/(E) tonghaosu or spiroether naming family, formula C13H12O2, and the spiro[4.4]non-3-ene scaffold. Local German chamomile records currently use the constituent as a major-profile marker at roughly 17-22% based on the open Estonian composition study.
Aroma and practical use
- Use the recorded green herbal, chamomile-like, fresh, bitter-aromatic descriptors to explore a blend's scent character; perceived strength also depends on the other ingredients.
- Read the route, preparation and experimental context before using a study finding to choose an oil.
Reported benefits and effects
Findings retain their study context. An animal or laboratory result describes that experiment.
A 2008 study isolated both E- and Z-spiroethers from German chamomile oil and reported inhibition of aflatoxin G1 production in Aspergillus parasiticus without suppressing fungal growth, with IC50 values of 2.8 microM for the E isomer and 20.8 microM for the Z isomer.
This is the clearest isolated-compound mechanistic paper found for the spiroether pair, but it is a fungal biosynthesis model rather than a human-use study.
This experimental finding does not establish benefit, dose or safety in people using this blend.
A 2007 HPLC-PAD-MS study found large amounts of both cis- and trans-en-yn-dicycloether in chamomile flowers, with the trans form more abundant than the cis form in the tested Roman chamomile and pineapple weed flowers.
This paper is useful for stereochemical occurrence and supports why archive records often treat the trans or generic spiroether as a major chamomile marker.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
A 2016 larvicidal paper on Artemisia absinthium reported that isolated Z-en-yn-dicycloether showed mosquito-larvicidal activity, with LC50 values around 16.24 to 25.88 microg/mL across six vector species.
This finding broadens the direct bioactivity record beyond chamomile chemistry, but it remains an insect model and not a human wellness outcome.
This experimental finding does not establish benefit, dose or safety in people using this blend.
Use concerns and concentration limits
Sensitization concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Phototoxicity concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Oxidation concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Penetration enhancementNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
No numeric constituent-specific use limit is available here. Missing is not an unrestricted-use clearance.
The Good Scents page for the trans or (E)-spiroether lists no GHS hazards on the accessible page, but also reports oral, dermal, and inhalation toxicity as not determined.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
No constituent-specific IFRA limit, human dermal study, or dedicated standalone toxicology monograph for isolated en-yn-dicycloether was verified in this pass.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
Constituents it may interact with
These are research candidates recorded in the interaction matrix. They do not add a proven-amplification bonus to the score.
alpha-BisabololAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
research review · whole_oil
No source citation attached.
Read alpha-Bisabolol report →How the effects were investigated
fungal_cytochrome_p450_inhibition
Isolated E- and Z-spiroethers from German chamomile inhibited fungal toxin biosynthesis in preclinical systems, with the authors linking the effect to inhibition of cytochrome P450 monooxygenases involved in aflatoxin and trichothecene pathways.
This experimental finding does not establish benefit, dose or safety in people using this blend.
What this report cannot establish
- A reported constituent percentage does not establish an effective human therapeutic dose or the amount absorbed into the body.
- The presence of a constituent does not guarantee a clinical benefit, rash treatment or sleep improvement from a custom blend.
- An unflagged concern or missing use limit does not establish safety for ingestion, inhalation, skin exposure or a particular person.
- A candidate constituent interaction does not establish that two oils amplify one another at the selected proportions.
- Constituent descriptors alone do not establish a precise top, heart or base lifetime in a finished blend.
Known data gaps (7)
- The archive's generic constituent id collapses stereochemical detail; future curation may need separate cis and trans spiroether records.
- No verified standalone CAS number was confirmed for the archive's generic combined entry, so `cas` remains null instead of guessed.
- Human safety, topical-use, and clinical efficacy data for isolated en-yn-dicycloether remain sparse.
- dermal_limit_pct corrected from an unsourced 0.1 to null (2026-07-13): no IFRA/RIFM numeric leave-on limit for isolated en-yn-dicycloether was located. An FDA science-forum case study on skin sensitization potential of German chamomile evaluated umbelliferone, apigenin, kaempferol, isorhamnetin, nerol, alpha-terpinene, carvone (positive) and caffeic acid, t-ferulic acid, cosmosiin, hyperoside, alpha-terpineol, alpha-bisabolol, chamazulene (negative) for sensitization, but did not include the spiroether/dicycloether compounds, so sensitizing remains null (genuinely unknown).
- No constituent-specific numeric dermal reference is available here.
- Some findings do not record an explicit exposure route; consult the linked study before applying them to a use.
- Interaction candidates lack an attached source citation and remain unqualified.