Cochinolide, a New γ-Alkylidene Bicyclic Butenolide with Antiviral Activity, and Its β-Glucopyranoside from Homalium cochinchinensis

Abstract
A new γ-alkylidene bicyclic butenolide designated as cochinolide (1) and its β-glucopyranoside (3) were isolated from the root bark of Homaliumcochinchinensis (Flacoutiaceae). Their structures, except absolute stereochemistries, were determined by spectroscopic means. Cochinolide (1) showed moderate antiviral activities against HSV-1 and -2.