Agent Name

Usnic acid

CAS Number

125-46-2

Formula

C18-H16-O7

Major Category

Other Uses

Synonyms

1,3-(2H,9bH)-Dibenzofurandione, 2,6-diacetyl-7,9-dihydroxy-8,9b-dimethyl-; 2,6-Diacetyl-7,9-dihydroxy-8,9b-dimethyl-1,3(2H,9bH)-dibenzofurandione; Usnein; Usniacin; Usninic acid; Usninsaeure [German]; Usno; [ChemIDplus]

Category

Preservatives

Description

Yellow solid; [Merck Index] Yellow crystalline solid; [MSDSonline]

Sources/Uses

Antibacterial compound present in lichens; [Merck Index] Used as preservative and antibiotic (folk remedy); [HSDB] Used as a topical antibiotic; Workers exposed to lichens (forestry and horticulture) may develop allergic contact dermatitis. [Kanerva, p. 1845]

Comments

May cause skin irritation and allergic contact dermatitis; [HSDB]

Reference Link

A case of contact dermatitis from lichens in south... [Contact Dermatitis. 1995] - PubMed result

Exposure Assessment
Vapor Pressure

1.14E-12 mm Hg

Adverse Effects
Skin Sensitizer

Yes

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Biomedical References

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Activities

Activities with risk of exposure: