Abstract Three new dihydroisocoumarin glucosides, macrophyllosides A, B and C were obtained from dry leaves of Hydrangeamacrophylla subsp. serrata, together with the previously known hydrangenol 8-β-glucoside. Using NMR and CD techniques and some chemical transformation, the structures were elucidated as (3S)-3′,4′,5′-trimethoxyphenyl-8-β- D -glucopyranosyl dihydroisocoumarin, (3R and (3S)-3′,5′-