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>Absence of Psoralen—type Phototoxicity from Usnic Acid, Some Lichens, and Lichen Substances*†*From the Department of Medicine (Dermatology), University of British Columbia, Vancouver 8, B.C. Canada.†Racemic usnic acid was obtained from Nutritional Biochemicals Corporation, Cleveland 28, Ohio, d- and 1-usnic acid were obtained from Koch-Light Laboratories, Colnbrook, Bucks., England.
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Absence of Psoralen—type Phototoxicity from Usnic Acid, Some Lichens, and Lichen Substances*†*From the Department of Medicine (Dermatology), University of British Columbia, Vancouver 8, B.C. Canada.†Racemic usnic acid was obtained from Nutritional Biochemicals Corporation, Cleveland 28, Ohio, d- and 1-usnic acid were obtained from Koch-Light Laboratories, Colnbrook, Bucks., England.
