From the methanolic extractive of the fruits of Quercus acutissima $C_{ARRUTHERS}$(Fagaceae) a mixture(QC-A saponin) of two ester glycosides, which were named as dotorioside I(3) and ll(4), was separated by silica gel column chromatography and HPLC. The structures of these two glycosides including their genuine aglycones(1,2) were elucidated as 1: $2{alpha}$, $3{eta}$, $19{alpha}$, 23-tetrahydroxyolean-12-en-28-oic acid, 2: $2{alpha}$, $3{eta}$, $19{alpha}$, 23-tetrahydroxyurs-12-en-28-oci acid, 3: 28-O-${eta}$-D-glucopyranosyl ester of 1, 4: 28-O-${eta}$-D-glucopyranosyl ester of 2, respectively, on the basis of chemical and spectral evidence.