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Huang YT; Onose J; Abe N; Yoshikawa K. (2009). »In vitro inhibitory effects of pulvinic acid derivatives isolated from Chinese edible mushrooms, Boletus calopus and Suillus bovinus, on cytochrome P450 activity«. Bioscience, Biotechnology, and Biochemistry. 73 (4): 855–60. doi:10.1271/bbb.80759. PMID19352038.