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A new isopimarane-type diterpene (liwariverol, 1) and eight known compounds were isolated and characterized from the EtOAc extract of the whole plant of Potamogeton crispus. The structure of 1 was elucidated to be 17-hydroxy-8αH-isopimara-9(11),15-diene by means of spectroscopic methods. Among the isolates, crenulatoside A (2), an acyclic sesquiterpene glycoside, was found to have anti-oxidative activity...
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