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1: xanthone V1, 2: 2-acetylfuro-1,4-naphthoquinone; 3: physcion; 4: bisvismiaquinone; 5: vismiaquinone; 6: 1,8-dihydroxy-3-geranyloxy-6-methylanthraquinone. Data with different superscript letters are significantly different (P<0.05).
