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4-Mercapto-4-methylpentan-2-one (cassis mercaptan)

4-methyl-4-sulfanylpentan-2-one

Cassis mercaptan, 4-MMP

Thiol · C₆H₁₂OS

Chemical structure of 4-Mercapto-4-methylpentan-2-one (cassis mercaptan)
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
19872-52-7
Molecular formula
C₆H₁₂OS
Molecular weight
132.22 g/mol
Origin
Nature-identical
Odor family
Fruity
Note
Top
Aroma
Blackcurrant bud, tomato leaf and the typical catty note; at very high dilution it turns tropical-fruity.

History

This thiol is a key odorant of blackcurrant buds and Sauvignon blanc wine. Its odour threshold is among the lowest of all aroma chemicals.

In perfumery

A component of cassis (blackcurrant bud) bases used in perfumery; handled only at extreme dilution.

Connections

EvokesBlackcurrant bud
Found in natureBlackcurrant bud, Sauvignon blanc wine

Regulatory status

No specific limit
IFRA 51
No dedicated IFRA Standard in the IFRA library as of Amendment 51.
EU CosReg
No specific entry in Annex II or III of Regulation (EC) 1223/2009.
EU allergen 2023/1545
Not on the list of fragrance allergens requiring labelling, including after Regulation (EU) 2023/1545.

Sources

  1. NCI/CADD Chemical Identifier Resolver, CAS 19872-52-7
  2. IFRA Standards Library, Amendments up to 51
  3. Regulation (EC) No 1223/2009, consolidated text of 18.05.2026, Annexes II and III