A new tetrahydrofuranoid lignan from Genkwa Flos In vitro effects of Genkwa Flos chloroform extract on activity of human liver microsomes UGTs and UGT1A1 Advances in studies on Sargassum and Genkwa Flos counteract with Glycyrrhizae Radix et Rhizoma Advances in studies on Sargassum and Genkwa Flos counteract with Glycyrrhizae Radix et Rhizoma