Naphthoquinones from the root barks of Juglans cathayensis Dode

Phytochemical investigation of Juglans cathayensis Dode root barks led to the isolation of two novel nitrogen-containing naphthoquinones named juglonbutine (1) and binaphthine (2). Their structures were elucidated by the extensive analysis of the spectroscopic data. In addition, six known naphthoquinones (3-8) were also isolated from the same material for the first time.