Cytotoxic Constituents of the Lichen Diploicia canescens

[摘要]：A new diphenyl ether (1), along with 12 known compounds, was isolated from the lichen Diploicia canescens. The structure of compound 1 was elucidated by spectroscopic data analysis, and the biosynthetic origin of this product is discussed. Secalonic acids B (7), D (8), and F (9) were isolated for the first time from D. canescens. The cytotoxic activities of 1-3, 6-8, and 10 against the B 16 murine melanoma and HaCaT human keratinocyte cell lines were evaluated.

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