Nine novel stereoisomeric triterpene dimers, xuxuarines A α (1), A β (2), Bα (3), B β (4), Cα (5), Cβ (6), Dα (7), Dβ (8) and 7 ,8 -dihydroxuxuarine Aβ (9), were isolated from a South American medicinal plant xuxua (Maytenus chuchuhuasca Raymond-Hamet et Colas). Spectroscopic and chemical evidences showed that their structures were composed of one quinoid and one aromatic triterpenes joined together by two ether linkages formed between the two A rings, and MD calculations confirmed their conformations.