Methanol extract obtained from Lindera erythocarpa leaves was successively fractionated with n-hexane, ethylacetate, n-butanol, and $H_2O$. From ethylacetate fraction, an active fraction was isolated through repeated silica gel column chromatography and recrystallization, and was identified as a stereoisomer complex of methyllucidone by MS and MMR analyses. The complex showed 85% antifungal activity at 50 {mu}g/ml$ against the disease wheat leaf rust.