It is an objective of the present invention to provide a polyphenol glycoside isolated from acerola, which has a binding mode that has not been conventionally known, and to provide the use of the same. The present invention relates to a compound represented by formula (I): ##STR00001## and an antioxidant, a glucosidase inhibitor, a food, a cosmetic, and a skin preparation for external use, each of which comprises such compound.