Two novel compounds from green walnut husks ( Maxim.).

Phytochemical investigation on the ethanol extract of green walnut husks ( Maxim.) led to the isolation of two previously unknown compounds, including a macrolide compound (13)-8-oxo-(9, 11)-8-oxo-octadeca-9,11-dien-13-olide () and a diarylheptanoid compound 1-(3'-methoxy-4'-hydroxyphenyl)-7-(3″,4″-dimethoxyphenyl)heptan-3-one (), together with 19 known compounds. The structures of these 21 compounds were elucidated by extensive analyses of NMR and HR-MS data, and the basis of spectroscopic analysis.