Two novel distilbenes, betulifol A and betulifol B, were isolated from
stems of Vitis betulifolia together with the previously known resvera
trol, (+)-epsilon-viniferin; ampelopsin A; ampelopsin C; heyneanol A;
hopeaphenol and vitisin A. Their structures were elucidated by 1D and
2D NMR analyses: (C) 1998 Elsevier Science Ltd. Al rights reserved.