Hydroxybiphenyl compounds

摘要

New hydroxybiphenyl compounds of the general formula: <IMAGE> wherein R1 stands for a hydrogen atom or a hydroxyl group, R2 for a hydrogen atom or a hydroxyl group, R3 for a hydroxyl group, a group of the formula -CH2-CH=CH2 or a group of the formula -CH=CH-CHO, R4 for a hydrogen atom or a group of the formula <IMAGE> and R5 for a hydroxyl group or a group of the formula <IMAGE> These compounds are obtained by extraction of "T &upbar& okoboku", i.e. dried cortex of Magnolia officinalis which belongs to the family Magnoliaceae. They are useful as pharmaceuticals or intermediates therefor, in particular as anti-allergics.