| Summary: | In this work, two new flavonoids, oblongifolioside A (<b>1</b>) and oblongifolioside B (<b>2</b>), along with eight known compounds (<b>3</b>−<b>10</b>), are isolated from the leaves of <i>Baccharis oblongifolia</i> (Asteraceae). The new structures are established through spectroscopic data and the known compounds are identified by comparison with data reported in the literature. The compounds (<b>1</b>−<b>10</b>) are evaluated in relation to their antiradical properties. Compounds <b>1</b> and <b>2</b> are found to exhibit high antiradical activity compared to their respective non-acylated flavonoids.
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