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CAS RN: 7562-61-0 | Product Number: U0023

(+)-Usnic Acid

Purity: >98.0%(T)(HPLC)
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Product Number U0023
Purity / Analysis Method >98.0%(T)(HPLC)
Molecular Formula / Molecular Weight C__1__8H__1__6O__7 = 344.32 
Physical State (20 deg.C) Solid
CAS RN 7562-61-0
Reaxys Registry Number 96698
PubChem Substance ID 87577753
SDBS (AIST Spectral DB) 7871
Merck Index (14) 9893
MDL Number


Appearance Light orange to Yellow to Green powder to crystal
Purity(HPLC) min. 98.0 area%
Purity(Neutralization titration) min. 98.0 %
Melting point 195.0 to 203.0 °C
Specific rotation [a]20/D +485 to +505 deg(C=0.7, CHCl3)
Solubility in Chloroform almost transparency
Properties (reference)
Melting Point 200 °C
Specific Rotation 495° (C=0.7,CHCl3)
Pictogram Pictogram Pictogram
Signal Word Danger
Hazard Statements H302 : Harmful if swallowed.
H370 : Causes damage to organs.
Precautionary Statements P501 : Dispose of contents/ container to an approved waste disposal plant.
P260 : Do not breathe dust/ fume/ gas/ mist/ vapours/ spray.
P270 : Do not eat, drink or smoke when using this product.
P264 : Wash skin thoroughly after handling.
P308 + P311 : IF exposed or concerned: Call a POISON CENTER/doctor.
P301 + P312 + P330 : IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell. Rinse mouth.
Related Laws:
EC Number 231-456-0
RTECS# HP5295050
Transport Information:
HS Number 2932990090
(+)-Usnic acid: A Lichen Metabolite with Antibiotic and Several Interesting Properties

(+)-Usnic acid is one of the most common and abundant lichen metabolites, and well known its antibiotic and several interesting properties.1,2) It is reported that the (+)-usnic acid is effective against a large variety Gram-positive bacterial stains including multi-resistant stains of Streptococcus aureus, enterococci and mycobacteria. (+)-Usnic acid also appears to be against Streptococcus mutans.
On the chemical structure, the absolute configuration of (+)-usnic acid at 9b position has determined by X-ray analysis to be R. 2,3,4) Of plausible tautomers, the low energy 1-oxo, 3-hydroxy confirmation is preferred according to calculations.1,2,3) The enolic 3-hydroxy group has the strongest acidic character (pKa 4.4) due to an inductive effect of the keto group.2) Recently, (+)-usnic acid derivatives are used as an organic ligand.5)


PubMed Literature


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