A new phenolic glycoside, 5-hydroxy-3-methoxyphenyl-6-O-syringoyl-$eta$-D-glucoside (1), was isolated from the n-BuOH-soluble fraction of Bridelia cambodiana along with three known phenolic glycosides. The structures of the isolates were determined on the basis of NMR ($^1H,;^{13}C$, HSQC, HMBC) and chemical method. All the compounds were tested for their antioxidant activity in a DPPH antioxidant assay.