T A novel class of 3,4-dihydroisoquinolines(7a~e)was designed, synthesized and characterized by IR, NMR and ESI-MS. The crystal structure of compound 7a(6,7,8-tr
Two new dioxyxanthones,polyhongkongenoxanthones A and B(1 and 2) were isolated from the herbs of Polygala hongkongensis,together with six known xanthones.Their