Two new triterpenoids, maquatic acid (1), a 2,3-seco-triterpene having an acetal in its A-ring, and 3-O-benzoyltormentic acid (2), were isolated from underground parts of Mentha aquatica, in addition to twelve known compounds, tormentic acid (3), 1-O-benzoylhyptadienic acid (4), 3-epi-ursolic acid (5), hyptadienic acid (6), 3-epi-maslinic acid (7), 3-epi-tormentic acid (8), ursolic acid (9), β-sitosterol (10), oleanolic acid (11), pomolic acid (12), micromeric acid (13) and 21α-hydroxyursolic acid (14) from aerial and underground parts of the plant. Compounds 4-6, 8, 13 and 14 have been isolated from the genus Mentha for the first time.
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