N-substituted sophora flavescens olefine acid derivative as well as preparation method and application thereof

The invention relates to an N-substituted sophora flavescens olefine acid derivative represented by a general formula IA or IB, a preparation method thereof, a medicine composite containing the derivative, a method for utilizing the derivative to treat diseases caused by Coxsackie B viruses, and an application of the derivative to prepare a medicine for treating the diseases caused by the Coxsackie B viruses.