New tetra-acetylated oligosaccharide diterpene from Cupania vernalis

a new glucosyl diterpene possessing a geranyl-geraniol skeleton and named vernanolide was isolated from a sapindaceae plant species, cupania vernalis, popularly named "arco de peneira". the structure of the isolated compound was determined by 1h, 13c nmr, ms, ir and 2d nmr experiments.