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(+)-usnic acid

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Origin: China

Cas No: 7562-61-0

Specification: 99%min

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    CAS No.: 7562-61-0 Formula: C18H16O7 Molecular Weight: 344.31500


    Usnic acid is a naturally occurring dibenzofuran derivative found in several lichen species with the formula C18H16O7. It was first isolated by German scientist W. Knop in 1844 and first synthesized between 1933-1937 by Curd and Robertson. Usnic acid was identified in many genera of lichens including Usnea, Cladonia, Hypotrachyna, Lecanora, Ramalina, Evernia, Parmelia and Alectoria. Although it is generally believed that usnic acid is exclusively restricted to lichens, in a few unconfirmed isolated cases the compound was found in kombucha tea and non-lichenized ascomycetes.
    At normal conditions, usnic acid is a bitter, yellow, solid substance. It is known to occur in nature in both the d- and l-forms as well as a racemic mixture. Salts of usnic acid are called usnates (e.g. copper usnate).

    Basic Info

    Chemical Name (+)-usnic acid

    1,3(2H,9bH)-Dibenzofurandione, 2,6-diacetyl-7,9-dihydroxy-8,9b-dimethyl-, (9bR)-;

    CAS No. 7562-61-0
    Molecular Formula C18H16O7
    Molecular Weight 344.31500
    PSA 121.13000
    LogP 2.12660


    Density 1.54 g/cm3
    Boiling Point 605.4ºC at 760 mmHg
    Melting Point 201-203ºC(lit.)
    Flash Point 223.3ºC
    Storage Condition 2-8ºC

    Safety Info

    RTECS HP5295050
    Safety Statements S36
    HS Code 2917399090
    WGK Germany 3
    Risk Statements R22
    Hazard Codes Xn


    Exposure Route Type of Test Species Observed Dose/Duration Toxic Effects
    Oral LD50 - Lethal dose, 50 percent kill Rodent - mouse 838 mg/kg 1.Details of toxic effects not reported other than lethal dose value
    Oral TDLo - Lowest published toxic dose Rodent - mouse 1500 ug/kg,female 1 day(s) after conception 1.Reproductive-Fertility-female fertility index (e.g. # females pregnant per # sperm positive females; # females pregnant per # females mated)

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