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A new cyclobutane ring system related to plicatin B has been isolated from the methanol soluble fraction of Psoralea plicata seeds and named as b-diplicatin B. In addition, the anti-repellent (-)-loliolide and phloretic acid ethyl ester [3-(4-hydroxyphenyl) propanoic acid ethyl ester) have been isolated from the same extract, their structures being determined on the basis of 1D (1HNMR and 13CNMR) and 2D (DQF-COSY, HMQC and HMBC) NMR and mass spectra. Stereoisomers of b-diplactin B have been optimized by means of density functional theory using the hybrid functional B3LYP.</p

Experimental and Density Functional Theory Study of a New Dimer with Tetrasubstituted Cyclobutane Ring System Isolated from Psoralea plicata Seeds