Antioxidant phenylpropanoid glycosides from the leaves of Wasabia japonica

From the MeOH extract of the leaves of wasabia japonica, seven phenylpropanoid glycosides (1-7) were isolated and determined based on spectroscopic data and chemical evidence along with eight known phenylpropanoids (8-15). The scavenging effect of compounds 1-15 on superoxide anion radicals was investigated using an electron spin resonance method.