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125-46-2

Name USNIC ACID
CAS 125-46-2
EINECS(EC#) 231-456-0
Molecular Formula C18H16O7
MDL Number MFCD00065294
Molecular Weight 344.32
MOL File 125-46-2.mol
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Chemical Properties

Appearance Crystalline, yellow solid. Insoluble in water; slightly soluble in alcohol and ether.
Melting point  200°C
alpha  D16 +509.4° (c = 0.697 in chloroform)
Boiling point  399.43°C (rough estimate)
density  1.2869 (rough estimate)
refractive index  495 ° (C=0.7, CHCl3)
storage temp.  Inert atmosphere,2-8°C
solubility  DMF:2.5(Max Conc. mg/mL);7.26(Max Conc. mM)
form  A crystalline solid
pka 4.00±0.40(Predicted)
color  White to yellow
Merck  9893
Contact allergens
Usnic acid is a component of lichens, also used as a topical antibiotic. Allergic contact dermatitis from lichens occurs mainly occupationally in forestry and horticultural workers, and in lichen pickers.
LogP 2.880
CAS DataBase Reference 125-46-2(CAS DataBase Reference)
EPA Substance Registry System 125-46-2(EPA Substance)

Safety Data

Hazard Codes  T,N
Risk Statements 
Safety Statements 
S22:Do not breathe dust .
S24/25:Avoid contact with skin and eyes .
RTECS  HP5270000
Hazardous Substances Data 125-46-2(Hazardous Substances Data)
Toxicity
LD50 i.v. in mice: 25 mg/kg (Gottlieb, Shaw)

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