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240 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGYgroups are attached to positions C3%u2019, C3 and C5%u2019, respectively. A comparison of the spectral data for compound 5 with the spectral data for (7S,8R,8%u2019R)-5%u2019-methoxy isolariciresinol in the literature [13] shows complete agreement. Therefore, compound 5 was identified as (7S,8R,8%u2019R)-5%u2019-methoxy isolariciresinol. (7S,8R,8%u2019R)-5%u2019-methoxy isolariciresinol has been shown to possess cytotoxic activity and good anti-cancer properties [14].Figure 1. Structures of compounds isolated from Avocado leaves.5. CONCLUSIONSFive compounds, including luteolin (1), luteolin-7-Oglucoside (2), rutin (3), (6S,9R)-roseoside (4), (7S,8R,8%u2019R)-5%u2019-methoxy isolariciresinol (5), have been isolated from avocado leaves (Persea americana Mill.) harvested in Dak Nong province, Vietnam. The structures of these compounds were determined using nuclear magnetic resonance (NMR) spectroscopy