Abstract: Ten compounds were isolated and purified by silica gel column chromatography and Sephadex LH-20 from the fruits of Capparis masaikai.Their structures were identified as medioresinol (1), erythro-guaiacylglycerol-β-O-4′-sinapyl ether (2),hedyotol C (3),hedyotisol A (4),hedyotisol B (5),ozoroalide (6),5α,6α-epoxy-3β-hydroxyergosta-22-ene-7-one (7),coniferyl aldehyde (8),3-hydroxy-5-(p-hydroxyphenyl) pentanoic acid (9) and β-hydroxypropiovanillone (10) by physicochemical properties and spectral data.The structural types of isolated compounds include lignans,macrocyclic lactone,sterols and phenols.Compounds 1-10 were isolated from this plant for the first time,among of them,compounds 1-7 were firstly reported from the genus Capparis.

Key words: Capparis masaikai, Capparis, chemical constituents, lignans