3' (3 methylbut 2 enyl) 3',4',7 trihydroxyflavane 1 3,4 dihydroxyisolonchocarpin 1 4 hydroxyisolonchocarpin 1 8 (1,1 dimethylallyl) 5' (3 methylbut 2 enyl) 3',4',5,7 tetrahydroxyflanvonol 1 Affinity-based ultrafiltration 1 Article 1 Bacterial neuraminidase docking 1 Broussonetia 1 Broussonetia papyrifera Broussonetia papyrifera roots 1 Chalcone 1 Chalcones 1 Flavonoids 1 Flavonols 1 IC50 1 Kinetics 1 Neuraminidase 1 Plant Bark 1 Plant Extracts 1 Plant Roots 1 Polyphenols 1 Prenylation 1 antiinfective agent 1 bacteriostatic activity 1 bark 1 binding affinity 1 broussochalcone A 1 broussochalcone B 1 broussoflavan A 1 broussoflavonol B 1