Dineolignans of 3-O-4′ diphenyl ether-type from fruits of Magnolia obovata

Seven dineolignans of 3-O-4′ diphenyl ether-type neolignans, named obovatalignans C-I, were isolated from the fruit of Magnolia obovata through repeated silica gel, octadecyl SiO2, and Sep-Pak chromatographies. Their chemical structures were determined via various spectroscopic methods including NMR, HR-MS, IR, specific rotation, and CD spectrometry. Especially, five of seven compounds had a 1,4-benzodioxane moiety in their structures.92