Material guide: raspberry ketone methyl ether — a berry molecule that makes up 2.40% of agarwood oil

About a 5 minute read.

The short version

• Name: raspberry ketone methyl ether, 4-(p-methoxyphenyl)-2-butanone, CAS 104-20-1, FEMA 2672
• Odour type: berry; twelve words in the odour field — sweet, dry, raspberry, rose, cherry, fruity, acacia, woody, powdery, honey, vanilla, violet
• Strength medium (rank 2); substantivity 324 hours at 100% (measured neat)
• Suppliers: 54; Cramer Class I; oral LD50 > 5000 mg/kg
• Occurrence: agarwood oil at 2.40%, aloe wood, anise seed
• One of the few genuinely balanced dual-use materials: 52 FL tags against 45 FR

One of the few that is actually balanced

I measured this last time: across the database's dual-use materials the median flavour tag count is 2 and the median fragrance tag count is 10 — even things used on both sides get five times more fragrance tags.

This one runs the other way: 52 flavour tags to 45 fragrance tags.

Its flavor and odor fields each stand on their own:

• Odour: sweet, dry raspberry, rose, cherry, acacia, woody, powdery, honey, vanilla, violet
• Taste (at 40 ppm): floral, woody, ionone, raspberry, fruity, spice, berry

And the taste field also carries a full dosage ladder: hard confection up to 100 ppm, soft confection 30 ppm, desserts 25 ppm, beverages and frozen dairy 10 ppm maximum.

(Another instance of buchu mercaptan's ladder — flavour-side specifications are usually far clearer than fragrance-side ones.)

Twelve descriptors across three families

Berry, floral, vanilla — one molecule.

And the four evaluations in odor_descriptions do not agree with each other either:

Concentration	Description
100%	sweet, dried raspberry, rose, cherry, cassie absolute (Luebke 1987)
5%	sweet, fruity, woody, powdery, honey, vanilla, raspberry and ionone-like (Mosciano 1998)
—	sweet/aniseed, floral/fruity, and cherry-raspberry on dilution
—	sweet, fruity, floral, anise, sweet raspberry, cherry with rose nuances

Note the aniseed. That is not a throwaway — the notes field says "present in anise (Pimpinella anisum)", and the methoxyphenyl structure is the anisaldehyde family's backbone.

Concentrated it reads anise; only on dilution does it become cherry and raspberry. (I measured why evaluation concentration matters — this is another material whose descriptions cannot be compared without aligning them.)

But the surprise is the occurrence field

occurrence:

agarwood oil @ 2.40%; aloe wood; anise seed

A berry molecule making up 2.4% of agarwood oil.

Agarwood — oud — is among the most expensive raw materials in the world, and its odour is usually attributed to sesquiterpenes and chromones. This compound is neither, and it accounts for 2.4%.

(Caveat: the occurrence field sweeps up everything anything has been detected in — the point I made about isovaleric acid and methyl mercaptan. The 2.40% is one sample in one paper, not a specification for agarwood oil.)

And agarwood has a precondition

Xu and colleagues say everything about agarwood in their opening lines, in BMC Genomics in 2013:

Agarwood is an expensive resinous heartwood derived from Aquilaria plants that is widely used in traditional medicines, incense and perfume. Only wounded trees can produce agarwood, and the huge demand for agarwood products has led all Aquilaria spp. being endangered and listed in Appendix II of CITES.

Only wounded trees.

They sequenced two cDNA libraries from healthy and wounded A. sinensis, obtaining 89,137 unigenes, of which 30 putatively encode enzymes in the sesquiterpene biosynthesis pathway — genes that become active after the tree is cut.

This is the fourth time this series has met the same theme. Birch tar is made by heat, allyl isothiocyanate is assembled when bitten, furaneol is locked to a sugar after it is made — and agarwood waits for the tree to be wounded.

The parent compound is scarce too

Raspberry ketone itself — without the methyl ether — barely exists in nature. Koeduka and colleagues open their 2026 Journal of Biotechnology paper:

Raspberry ketone is a valuable aromatic compound that occurs only at trace levels in natural sources.

They put benzalacetone synthase from rhubarb and RZS1 from raspberry into tomato, and the transgenic fruit accumulated raspberry ketone (9.9–19.3 µg/g fresh weight) during ripening — predominantly as glycosides. LC-MS/MS identified the monoglucoside as the major form, concentrated in the peel, with negligible amounts in flesh, seeds or leaves.

"Predominantly as glycosides" is the same mechanism as furaneol. The plant makes the aroma compound and immediately locks it to a sugar.

(Caveat: that paper measured raspberry ketone, not its methyl ether. I cite it for the "trace levels in natural sources" point and the glycoside storage, not because it tested this material.)

How to use it

• It is a bridge between berry, cherry and powdery floral. Twelve descriptors is not noise — it genuinely sits at an intersection.
• Substantivity 324 hours, measured neat, so it can be compared directly with others — which is not the norm in this database (I corrected myself on that).
• Rank 2 only — it does not need thiol-grade caution.
• Mind the anise facet. Concentrated it leans anisic, which may not be what you want.
• Cramer Class I, oral LD50 > 5000, GHS only H302. One of the safer materials in this series.
• 24 months, cool and dry.

What this doesn't establish

• I have not smelled it. This is fields, whole-database statistics, and two papers.
• Neither paper is about this material. Xu 2013 is agarwood formation transcriptomics; Koeduka 2026 measured raspberry ketone, not the methyl ether.
• "Agarwood oil @ 2.40%" is a number inside the occurrence field; I did not trace its source, nor do I know which agarwood or which origin.
• That agarwood's odour comes mainly from sesquiterpenes and chromones is Xu 2013's statement; I have no data on this compound's sensory contribution to it.
• I did not trace the source of the taste field's dosage ladder, nor which regulatory jurisdiction it describes.
• I checked no IFRA text, nor CITES's specific provisions on agarwood products.