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Aglycone bacteriostasis of ash bark was superior to glycoside, fraxetin and aesculetin bacteriostasis were most powerful in 5 kinds of coumarin monomer. 秦皮中苷元的抑菌作用優(yōu)于苷，5種香豆素類單體中秦皮素、秦皮乙素抑菌作用最強。