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<i>Salvia przewalskii</i> Maxim is a perennial plant from the genus <i>Salvia</i> (family Lamiaceae). The roots of <i>S. przewalskii</i> were long used as a traditional herb to treat blood circulation related illnesses in China. As part of our continuing interest in polycyclic natural products from medicinal plants, two unprecedented adducts comprised of a <i>dinor</i>-diterpenoid and a 9′-<i>nor</i>-rosmarinic acid derivative, linked by a 1,4-benzodioxane motif (<b>1</b> and <b>2</b>), were isolated from the roots of <i>S. przewalskii</i>. Their structures were established by extensive spectroscopic approaches including 1D, 2D NMR, and HRFABMS. Their cytotoxic activities against five human tumor cell lines were evaluated.