Hydroquinone glycosides from leaves of Myrsine seguinii

From leaves of Myrsine seguinii, seven hydroquinone glycosides were isolated. By spectroscopic analyses, their structures were elucidated to be arbutin, arbutin 2′- and 6′-O-β-apiofuranosides (seguinosides A and B, respectively), and the benzoyl, p-hydroxybenzoyl, 3-methoxy-4-hydroxybenzoyl and 3,5-dimethoxy-4-hydroxybenzoyl esters of the alcohol hydroxyl group on C-5″ of arbutin 2′-O-β-apiofuranoside (seguinosides C-F, respectively).